Unable to Add user to License

[RQ IT Admin]

We are attempting to assign users to the Existing Adobe DC licenses in our ORG. but we have been unable to add anyone new for a while. 

When we go to add someone we get errors like these :

Please note we have tried to add Several different Users in our ORG, but get the same errors everytime.

Please let me know if you need any other info.

[kglad]

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