How to turn off add contact prompt DejaOffice AND
From CompanionLink Support
Starting with version 1.11.7 of DejaOffice for Android, users may be prompted after a call with an unknown contact to create a contact record.
The prompt includes the option 'do not ask again', but this applies to the specific number - meaning the prompt will reappear for the next unknown contact.
To turn off this setting, open DejaOffice Settings > DejaContact settings > Un-check 'Add unknown contacts after call'.