I have 1 user (works for everyone else) that gets
You don't have permission to open this page. If you're a new user or were recently assigned credentials, please wait 15 minutes and try again.
The 2 fixes i've found in my searches are to delete and re-create the ECP, did that, didn't help. The other was to verify the user had MyOptionsPage role, and he does.
I am an Exchange Admin and can open any mailbox, and any other user click options fine, but with his mailbox I also get the same error. Ideas ?