If you're facing a similar issue where the following error occurs 'PAN is client of another ERI' you need to deactivate a previously added ERI. You can watch this video for instructions
After you've successfully deactivated the ERI as shown in the above video,
- Navigate back to Quicko,
- Click on User Icon
- Navigate to Integrations > ERI Integration
- Click on Grant
This should resolve the above issue and you will be able to successfully E-file your Income Tax Return.