---

@mkscpa wrote:

Unfortunately they expect that I can solve this!

---

Yes, that's what Intuit expects you to do also, unfortunately.

What happened when your client tried to login?

Is this a new client?

Has he/she accepted your invite?

Has he/she responded to any question or submitted any document either for the current or previous years?

Did your client log in by clicking on the button within your invitation email (which contains a token) and use the email address to which the invitation was sent (which should be populated automatically by the browser)?  Your client should not bypass your invitation email and attempt to access Intuit Link for a new tax year for the first time by logging in directly with his/her credentials.  This is critical and should first be tried by your client because it ensures your client's Intuit Link account is properly "connected" with yours for the relevant tax year.