Can't create new inbound email account with known good connection

I have a problem hooking up a mailbox with SuiteCRM ( Version 7.13.1).

There’s one mailbox hooked up already that I did a couple of years ago that’s on the same domain and server. By coincidence, the MS API token/secret expired and I had to get a new one - and that works no problem.

However, I have another, new mailbox that refuses to work using the same connection. I’m able to get to OAuth and fetch a token (and I’ve made sure it is the correct mailbox for OAuth, I’ve tried incognito windows etc), and I’ve even decoded the access token and it seems ok.

I can get to the point of ā€˜new inbound email account’, and it even lets me select ā€˜INBOX’ and such, so it looks like it is at least partly aware of the connection.

But then whenever I ā€œtest connection settingsā€, it thinks for ages, and then comes back with "
[CLOSED] IMAP connection broken (server response)
Please check your settings and try again."

I’ve checked spelling, tried bending it, shaking it, pulling it, pushing it, but nothing seems to make any difference. The mailbox has the exact same permissions as the ā€˜known good’ one as far as I can tell.

Does anybody have any idea what the problem might be, please?

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Thank you, one of those videos actually was helpful, because it said to ignore the ā€œtest connection settingsā€ because the test will tell you that the server connection failed when it actually didn’t, and that did indeed prove to be the case - if I ignored the test and proceeded as if it was all good, it worked. Which is extraordinarily frustrating how many hours I pointlessly wasted, but, that’s why they pay me the big bucks, I guess.

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