Why is Adding a MS 365 Account to MS Outlook 2021 on 3 W10 PCs Such a Different Experience?

Copper Contributor

How can adding a MS 365 email account to MS Outlook 2021 on three different PCs have such different install/setup methods!? All 3 PCs are running the same version of MS Outlook 2021, and have the latest version of Windows 10 with all updates.

 

PC1, MS Outlook 2021: After clicking Add Account and entering my MS 365 email address, it does the following:

 

It starts searching automatically for the email account, then states it's unencrypted and if I would like to continue, which I do. It then it says it failed to setup the email account, showing a red X to the left of Searching for the email account. It gives me the option to setup manually, which also does the same searching and fails. There is an option to select POP or IMAP, but isn't MS 365 accounts considered the Exchange type? Also, I've read that IMAP is not supported with MS 365 accounts, and who wants to use POP when you use multiple devices.

 

PC2, MS Outlook 2021: After clicking Add Account and entering my MS 365 email address, it does the following:

 

Instead of searching automatically as PC1 did, it pops up a list of mail types to select from. I have tried both MS 365 and the Exchange type, but then it starts searching as PC1 did, and fails in the same way.

So, why is it asking me to select the email type, while PC1 and PC3 do not?

Am I correct to select the MS 365 type? The only reason I also tried Exchange is because that is the only option when setting up the email on my iPhone, and it worked.

 

PC3, MS Outlook 2021: After clicking Add Account and entering my MS 365 email address, it does the following:

 

It quickly finds the email account. I don't think it even shows that it was searching for it as the other two did. It then says it was added successfully and to restart Outlook.

I have tried creating a new profile from Mail under Control Panel, but PC1 and PC2 continue to fail to add the MS 365 email account.

 

On PC1, I did finally manage to get it to work by editing the registry as instructed from MS from this link:

https://support.microsoft.com/en-us/office/something-went-wrong-and-outlook-couldn-t-set-up-your-acc...

 

It shows how to add two registry keys: ExcludeLastKnownGoodUrl and ExcludeSrvRecord

After that, Outlook added the account with no issues. I'm worried though because the link also says this registry edit should only be temporary. That as soon as the web service provider or web hosting provider resolves the issue, the Outlook registry key must be removed!

 

So, wouldn't that be Microsoft, since the issue is with MS 365?

 

Any suggestions to get PC1 and PC2 to add the MS 365 email account to Ms Outlook 2021?

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