English Test Of Strength IV *HELP*

Hello,

I have created 3 new battles against the “Hardest AI” and won by wonder victory each time but the mastery is just not unlocking for me?

I have completed each mastery before this with no issues (even previous test of strengths) is there a common bug for this or a particular reason it could not be unlocking?

Any help is appreciated.

Thanks

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I have this same issue and I have it on the first Japanese test of strength.