Safari - outlook sign in loop

Question

I'm having trouble with signing into the browser version of outlook.
I'm able to sign in but I'm in a continuing loop to click on the account and outlook never loads.
I've cleared browser cache and history but this doesn't resolve the problem.
I can log into the account in Brave and other office accounts are able to login on Safari. The problem seems to be limited to one account.

The account is an office365 account.

Added information that I didn't post originally:
Before posting I tried a private window with and without extensions or blocker.
I also tested a normal window without extensions and blockers. I've also turned off prevent cross site tracking to test. And I tried opening the account in a different profile on safari as well.
None of these helped solve the issue.

Issue - resolved.
The loop stopped today and it resolved on the mailbox.

Answer 1

Hi, Amanda

Since this account opens in Brave and your other accounts open in Safari, I wouldn’t assume the mailbox itself is broken. I’d test what Safari is doing differently for this account.

Here are some suggestions you can try:

Open a New Private Window in Safari and try the affected account there. If it opens, go to Safari > Settings > Extensions, turn off your extensions, and try again in a regular window. If that fixes it, turn them back on one at a time to find the one interfering.

If you use a content blocker, check Safari > Settings > Websites > Content Blockers and turn it off for the Outlook site while testing.

Check for a macOS update, then restart the Mac. Safari updates are delivered through macOS.

If it still loops, let us know whether it happens in the Private Window too, and whether Safari shows any error. That result will help narrow down the next step.