Can not install K9 on my android phone

I try to install K9 on my android smartphone;;; no way …my usersname or password are invalid…they are the same as on my gmail en Thunderbird account … what do I di wring please ?
Yhanks or your help .

Because K9 doesn’t yet support OAUTH2 you need to set up an “app password” for what google calls “less secure apps”. See for some details. Your gmail login password will not work with K9.

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Ooooh ! Thank you njeyaakili ! I am going to find out with your forum link :slightly_smiling_face:
Kind regards.