An error occurred while saving the commentSergei commented
It is happening when I change the scaling in chat window to other than 100% (I usually use 120%).
To reproduce the issue just change scaling to 120%. Then open any other chat window where there are many messages (for several screens by scrolling). And try to scroll up by mouse scrolling button. After first attempt it will scroll the chat back down to the latest message. Then try to scroll up again. And it will scroll back to the latest message again. I'm starting to nervous after that and trying to scroll up and up. Sometime I need to use scrolling several times (mostly 2-3 times). It is very annoying.
The engineering team is continuing to work on adding support for multiple accounts on desktop clients. We will first launch support for 1 work/school account and 1 personal account so users can enjoy Teams for work and personal side-by-side. Windows and MacOS. Support for multiple work accounts is still being worked on and will come at a later date.
You can track status via the roadmap here: https://www.microsoft.com/microsoft-365/roadmap?searchterms=68845.