Hi,
i have implemented a trigger and a handler class which work after update and it creates a new record. This trigger works only for some users not for all users. I checked the permission things, did not get any clue. I also changed the class to 'without sharing' but it also does not work.
I want it to work for all users irrespective permission, hiearchy etc.
i am unable to understand. what's going wrong. kindly suggest.

Trigger
---------------------------
trigger TransferSAASRecord on Opportunity (after insert, after update) {
    if(trigger.isafter && trigger.isupdate && TransferSAASRecordHandler.firstRun){
          TransferSAASRecordHandler.newInititationOpp(Trigger.new);
          TransferSAASRecordHandler.firstRun = false;
}
    if(trigger.isafter && trigger.isinsert){
        TransferSAASRecordHandler.sendNotification(trigger.new);
    }
}


Apex Class : 

public without sharing class TransferSAASRecordHandler {
    public static boolean firstRun = true;
    public static void newInititationOpp(List<opportunity>Opp){
        List<opportunity>newInitOpp = new List<opportunity>();
        set<id> ids = new set<id>();
        for(opportunity oldopp : opp){
            ids.add(oldopp.Id);
        }
        for(Opportunity o: [select id, name, stageName, ownerId, createdDate, FC_Opportunity_Status__c, RecordtypeId, recordtype.name, ForecastCategoryName,sekund_re_Leadquelle__c, terti_re_Leadquelle__c, closeDate, leadsource, AccountId, Account.name, currencyIsoCode, kommentar_zur_phase__c, LostReason__c, BDR_Recyceln__c, PrimaryContact__c from Opportunity where recordtype.name =: 'SAAS' AND Id IN: ids ]){
            if(o.stageName == 'Geschlossene und gewonnene' && o.RecordType.name == 'SAAS' && o.FC_Opportunity_Status__c == 'New Licence' ){
                Opportunity oppty = new opportunity();
                oppty.Name = O.Account.Name +' ' + 'Media';
                string S = oppty.Name;
                system.debug(S);
                //oppty.RecordType.name = 'Initiation';0122p000000t5g4AAA
                oppty.RecordTypeId = '0122p000000t5g4AAA';
                oppty.StageName = 'Pre Analysis';
                oppty.LostReason__c = o.LostReason__c;
                oppty.Kommentar_zur_Phase__c = o.Kommentar_zur_Phase__c;
                oppty.CloseDate = o.CloseDate.addmonths(2);
                //Oppty.BDR_Recyceln__c = o.BDR_Recyceln__c;
                //oppty.Account.name = o.Account.name;
                oppty.AccountId = o.AccountId;
                oppty.CurrencyIsoCode = o.CurrencyIsoCode;
                //oppty.Name = o.Name;
                oppty.ForecastCategoryName = o.ForecastCategoryName;
                oppty.LeadSource = o.LeadSource;
                oppty.sekund_re_Leadquelle__c = o.sekund_re_Leadquelle__c;
                oppty.terti_re_Leadquelle__c = o.terti_re_Leadquelle__c;
                oppty.OwnerId = '0052p000009pHKVAA2';//'0052p000009pHKVAA2';
                oppty.PrimaryContact__c = o.PrimaryContact__c;
                newInitOpp.add(oppty);
                system.debug(NewInitOpp);
                /*
                 *
  
  Close Date: "CloseDate of original Opp + 2 Months" 0060E00000o5MlhQAE
  Lead Source: Copy from original Opp
  Sec. Lead Source: Copy from original Opp
  Tertery Lead Source: Copy from original Opp
  Primary Contact: Copy from original Opp
  Currency: Copy from original Opp
 */
            }
        }
        try{
            insert newInitOpp;
            system.debug(newInitOpp);
        }
        catch(system.DmlException e){
            system.Debug(e);
        }
        
        set<Id> idss = new set<id>();
        string s;
        for(opportunity createdOpp : NewInitOpp){
            idss.add(createdOpp.id);
            s = createdopp.Id;
            string ManagerEmail = createdOpp.Owner.Manager.Email;
        }
        if(NewInitOpp.size()>0){
                 List<Messaging.SingleEmailMessage> mails = new
      List<Messaging.SingleEmailMessage>();
                 String body = 'A new opportunity was created. kindly click on this link https://XXXXXXXX.lightning.force.com/lightning/r/Opportunity/'+ s +'/view';
            for(Id oppId : Idss){
                string email = oppId;
                string[] toaddresses =  new string[]{'XXXXXXXXXXXX'};//[select email from user where username like '%nishant%'];
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
                mail.setToAddresses(toaddresses);
                mail.setSubject('Automated email: Opportunity created');
                mail.setPlainTextBody(body);
                mails.add(mail);
            }
            if(mails.size() > 0){
                Messaging.sendEmail(mails);
            }
            }
    }
    
    public static void sendNotification(List<opportunity>Opp){
        string s;
        set<id> ids = new set<id>();
        for(opportunity oldopp : opp){
            ids.add(oldopp.Id);
            s = oldopp.id;
        }
        system.debug(opp);
        List<feeditem>notify = new list<feeditem>();
        for(Opportunity o: Opp){
            system.debug(o);
            if(o.OwnerId=='0052p000009pHKVAA2' && O.RecordTypeId == '0122p000000t5g4AAA'){
            feeditem sendnotification = new feeditem();
            sendnotification.parentId = o.Id;
            sendnotification.body = 'Hello,the following Opportunity https://XXXXXXXXXX.lightning.force.com/lightning/r/Opportunity/'+ s + '/view is created. Please have a look and assign it to one of your Team Members, to start Sales Process. ';
            sendnotification.Title = o.name;
            sendnotification.createdbyId = o.OwnerId;
            //sendnotification.LinkUrl = 
            notify.add(sendnotification);
            system.debug(Notify);
          }
        }
        try{
            insert notify;
            system.debug(notify);
        }
        catch(system.DmlException e){
            system.Debug(e);
        }
        
}
      public void sendNotificationReminder(){
        List<feeditem>notify = new list<feeditem>();
        List<opportunity> opp = [select id, CreatedbyId, name, ownerId, RecordtypeId from Opportunity where recordtype.name =: 'Initiation']; 
            string s;
            //for(opportunity opps : Opp){
              //  s = opps.Id;
           // }
        for(Opportunity o: Opp){
            if(o.OwnerId=='0052p000009pHKVAA2' && O.RecordTypeId == '0122p000000t5g4AAA' && o.CreatedById != '0052p000009pHKVAA2'){
            feeditem sendnotification = new feeditem();
            s = o.Id;
            sendnotification.parentId = o.Id;
            sendnotification.body = 'Hello,the following Opportunity https://XXXXXXXX.lightning.force.com/lightning/r/Opportunity/'+ s + '/view is still assigned to you. Please have a look and assign it to one of your Team Members, to start Sales Process. ';
            sendnotification.Title = o.name;
            sendnotification.createdById = o.OwnerId;
            notify.add(sendnotification);
            system.debug(Notify);
          }
        }
        try{
            insert notify;
            system.debug(notify);
        }
        catch(system.DmlException e){
            system.Debug(e);
        }
}
}