Check somewhere here (or in the M9 thread). There the quite inconvenient procedure is described.
Yeah, got it thanks. Quite convoluted. You need to have bought the license on an email that allows POP3. You then go to Settings > Help > Account and then click the + at the bottom to add a new account. You need to enter your POP3 address, and email user name and password. For Google I had to enable less secure apps and disable 2FA.
Assume it only checks once, so will now re-enable both.
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