Problem Statement:
Existing users receive the organization invitation email and click on the Accept invitation button taking them to a Sign up form where the email address is pre-filled and the field is grayed out.
They are redirected to /u/signup/invitation , not /u/login/invitation in the organization invitation flow, and they must click “Already have an account? Login” to navigate away from the signup prompt.
Solution:
We suggest the below workaround.
Add users to the organization directly instead of sending them the invitation.