Cannot cross play

Error is different game versions. I’m on PC via battle net client with no updates even after clicking check for updates.
Friend is on PS5 with no pending updates.
The only difference is that he has vessel of hatred and I don’t.
We both have cross-play on.
Neither of us are in a clan.
We both created a new character on the same difficulty with the campaign un-skipped and we still had the error.
Is this a know issue and are there any fixes or things I need to do.

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