Salve, da tempo ho 3 accounts Microsoft sulla vostra App mail client.
Microsoft da Settembre richiede un’autenticazione moderna OAuth 2.0 e mi ha già scritto che presto non potrò più usare i miei account con voi perché se ho ricevuto quella mail è perché la App K9 Mail non ha questo tipo di autenticazione, ma nelle scelte per impostazioni dei server la vedo, non capisco perché non mi faccia proseguire. La vostra App mi piace perché con notifica di lettura è molto comoda e non voglio dover cambiare e installare per forza quella loro Microsoft, non mi piace avere troppe Apps sul mobile. Gli sviluppatori mi diano un aiuto al piu presto per favore, vi ringrazio
Already been answered several times, like here. Try using the search.
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Hi, I already tried many times but only found many requests of support but not resolution answers that why I decided to ask to support, and here below I only read more requests of support for the same topic but any real good solving problem. If you find someone writing to have solved with Microsoft please link here below the discussion. At this time K9Mail hasn’t possibility to add Microsoft Account that miss standards modern Security Auth Factor. I apologize for my basic English.Thanks you so much
There is a complete guide here and a shorter version that I linked you earlier today. I’ll post it here for you again:
From cketti:
Currently you have to manually update your existing accounts. Go to Settings → [Account] → Fetching mail → Incoming server , select OAuth 2.0 under Authentication , then press the Next button. Same under Settings → [Account] → Sending mail → Outgoing server.
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Hi, I’ll try patiently to translate to understand better how to do.
The problem aren’t you as K9 mail but Microsoft giving us a lot of useless problems. Hackers haven’t any problem to hack accounts…
thank you so much
Anyway I already did that passage and the server respond that failed authentication unfortunately
Well then no idea, maybe someone else can help. I’m not sure if a LOG would do anything at this point 
Off the top of my head idea, if the phone that can’t OAUTH with Microsoft had another browser set as it’s default browser, try setting the browser default back to the original browser - likely Chrome or Safari.
Then try to OAUTH in K-9 to Microsoft.
But I regularly browse with Chrome as default! Microsoft Is putting a modern 2FA but they are making a lot of problem by using 3rd part clients
My answer has been hidden I don’t know why. Microsoft wrote me saying that I if I’ve received that message is why the app client I’m using (K9 mail)doesn’t support the new modern Auth they will apply to all mail accounts. I need developers renew settings or security to be able to use it in the future
The settings are there and I told you twice already how to do it.
What’s the K-9 application version on the phone?
6.804 the last updated