Hi Yahya
My name is Daniel. I will be more than happy to assist you.
As a fellow MS Community forum user, I understand how confusing it can be.
Sounds like you are trying to access MS Team free personal account via the MS Team desktop app.
When it comes to MS Team free, I'd like to let you know there are 2 types of accounts:
1. MS Team free personal account.
2. MS Team free organization account.
Please note, those 2 accounts are not the same. They are indeed different.
As of today, MS Team free personal account can be accessed without issue via MS Team mobile app and via MS Team online via web browser on the computer.
So if you want to access MS Team free personal account from your computer, you need to use a web browser and then visit:
https://teams.live.com the reason for this not all MS Team free personal account users can access the MS Team desktop app.
Actually, MS Team free personal life account is targeted to be available on the MS Team desktop app in February 2021 but the current status is still in the rolling-out status and the official release has been delayed for a few months. Since the feature is still in the rolling-out status then that means there's a chance the feature is not available yet on your account:
https://www.microsoft.com/en-us/microsoft-365/r...
As per the news page in the following link, the feature is predicted won't be ready until the second half of 2022.
https://www.onmsft.com/news/microsoft-teams-mul...
So let's give more time for the engineering team to finish the feature, Hopefully, we will hear good news soon. Thank you for your patience and understanding.
Having said that, if you want to use the MS Team desktop app, as of today, you can access it by using an MS Team free organization account. You can use the same email account for both MS Team free organization account & MS Team free personal account. Signing up for MS Team free personal account requires you to register a phone number but on the other hand, but signing up for an MS Team free organization account doesn't require you to register a phone number.
I'd also like to let you know, MS Team free organization account has more features compared to MS Team free personal account. So feel free to sign up for the MS Team free organization account to take advantage of the opportunity. The following article explains how to sign up for MS Teams free organization account:
https://support.microsoft.com/en-us/office/sign...
You can access MS Team free organization account from MS Team mobile app, desktop app & via a web browser but it requires a different URL from I mentioned earlier above:
https://teams.microsoft.com
Please note, as of today, only Chrome & Edge browsers are officially supported browsers for the MS Teams web app.
P.s: This is a peer-to-peer support forum. I'm Non-Microsoft Staff. Mostly everyone here are users, helping other users.
DISCLAIMER:
There's a link above from the non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Kind Regards