They never approve
They have not opened Providers yet, or they signed into the wrong company. Resend the invitation. Confirm they signed in to the workspace you invited, not an old leftover account. No account.Wrong Delivery ID
FormatSUA-XXXX-XXXX. Using your ID tries to connect you as the person receiving UAT. You need their ID to send. Copy and paste. Do not type it from a screenshot.
They declined, revoked, or blocked
They said no, or someone ended it. Send a new invitation or use a new Delivery ID after you agree by email or chat. There is no secret unblock screen, and there is no public status page.Code vs ID vs invite
Three valid ways. Do not mix a stale code with a new company. Start one path and finish it. How connections workCan't deliver
After they approve.
Email support
Names, not stack traces.