Dear Ruth Carlos-Martinez
Thank you for posting in the Microsoft community.
Regarding your question, after a short investigation we found that it is a compatibility issue between the CHROME kernel and Outlook.Com.
Com. In order for you to quickly resolve the issue, we recommend that you use a non-Chrome-core browser for the time being.
Or use the BETA version of EDGE to test if this triggers the issue.
https://www.microsoft.com/en-us/edge/download/insider?form=MA13FJ
The second part:
Microsoft has started investigating this issue, if community users with the same issue submit your Chrome/Edge version number, it will help us to quickly locate the problematic version.
You can tap the three dots in the top right corner of EDGE/Chrome - Settings - the option About EDGE/Chrome at the bottom left.
We have tested 126.0.6478.62 and it works fine for now, so you can also update Chrome to this version number to test it.
Third part:
Some users have reported that Chrome in Android phones also triggers this issue, which leads us to suspect that some security configurations in Chrome are causing the problem.
We look forward to further responses.
Your feedback is very important to us.
Best Regards
Clara G| Microsoft Community Support Specialist