My Trigger is working in sandbox but not working in Production.
Help me out

My Trigger:

trigger AccountNameUpdate on Booking_Link__c (before insert, before update) {
    List<Account> accountList = new List<Account>();
    String CustomNumber;
    for(Booking_Link__c bl : Trigger.new)
    {       
        CustomNumber = bl.Customer_Number__c;
       
    }
    system.debug(CustomNumber);
    accountList = [Select Id, OwnerId, Customer_Number__pc from Account where Customer_Number__pc =:CustomNumber ];
    system.debug(accountList);
    for(Booking_Link__c bl : Trigger.new)
    {
        system.debug('Entered into Trigger.new ');
        for(Account a : accountList)
        {
            system.debug('Entered into accountList loop ');
            system.debug(bl.Customer_Number__c);
            system.debug(a.Customer_Number__pc);
            system.debug(bl.T2G__c);
            
           if(bl.Customer_Number__c == a.Customer_Number__pc && bl.T2G__c==True)
            {
                system.debug('Entered into if loop');
                system.debug(a.Id);
                system.debug(a.OwnerId);
                bl.Account__c = a.Id;
                bl.OwnerId = a.OwnerId;
                  
            }
        }
    }  
}

Its Test Class:

@isTest
public class AccountNameUpdate {
@isTest  static void updateAccount(){
        Account a = new Account();
        a.Name = 'Abhishek Gupta';
        insert a;
        Booking_Link__c bl= new Booking_Link__c();
        bl.Customer_Number__c = a.Customer_Number__pc;
        bl.T2G__c =True;
        bl.Account__c = a.Id;
        //bl.OwnerId = a.OwnerId;
        insert bl;
    }
}


Please help me out from thiss..

Thanks and Regards,
Azar Khasim.