Contacts related to an Account are not showing up in the pop-up

So the Account.Id condition is looking for a true Salesforce ID (18 digit) but instead it is getting passed some text, T_Deloitte.

On your contact lookup field settings, Filter tab…

Change your lookup fiber from Account.Id to just Account.

From this:

To this (don’t click through the account ref to the ID field):

See if that works!