When trying to place a new block to give a Villager a profession, they will not accept any. No particles appear, and the Villager doesn't changes it's skin to match the desired profession. The Villager also will not accept trades when right clicking. After several attempts at replacing the Villager, and checking to make sure they weren't Nitwits, the Villagers continue to not accept the profession.
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No, it was a freshly grown up Villager that refused to accept any profession, and it wasn't a Nitwit either.

Thank you for your report!
We're actually already tracking this issue at MCPE-49580, so I will resolve and link this ticket as a duplicate.
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Was the villager previously employed and traded with?