E5 Sandbox = You have used too many phone numbers

[Jackiereid108]

Prop. simple fix but can't find. Cleared cache, verified phone number, waited 24 hours etc. to try again, tried another number. Cannot get past initial signup because of below. Any suggestions?

We can't continue with the signup process for the following reason:

You have used too many phone numbers.
For help with your Microsoft account, go to Microsoft account and verify your information.

MS-CorrelationId: 00000000-2ea8-4dca-8d7b-ddfdd21ff94f

Code: 40902