As long as you have a CAC reader and your military ID, you can access Teams using a government computer or even personal laptop. To access Teams go to https://dod.teams.microsoft.us/
If you get an "Access Denied" message try clearing your cache.
If you need assistance with clearing your cache, follow the directions below.
1. Open the search menu on your PC and search for %appdata% Open the folder when it appears in the results.
2. Open the Microsoft folder, and then the Teams folder.
3. Here, you'll need to find and delete three specific folders: Cache, Code Cache, and GPUCache. Be sure to delete the folders themselves, and not just what's inside of them.
Don't worry about corrupting your Teams app — once you reopen Teams, it'll create the folders again, without anything inside.
Search %appdata%\Microsoft\teams\Cache
Delete Cache, Code Cache, and GPUCache folders
On a Mac, most cached files are kept inside of the "Application Support" folder.
1. Open a Finder window and click Go at the top of the screen, and then Go to Folder…
2. In the search box that opens, type and submit ~/Library/Application Support/Microsoft/Teams
3. In the folder that opens, find and delete the Cache, Code Cache, and GPUCache. You can delete them by right-clicking, or by dragging them to the Trash icon in your dock.
The next time you open Teams, the folders will spawn again, totally empty.
Search ~/Library/ApplicationSupport/Microsoft/Teams
Delete the Cache, Code Cache, and GPUCache folders
TIPS:
I tend to have less Issues when using Google Chrome or Firefox.
If you still have Issues try using an Incognito window In Chrome or Private Window In Firefox.
When you try to sign in to Microsoft Teams in Microsoft Edge, Google Chrome, Mozilla Firefox, Safari, or Internet Explorer, the Teams site loops continuously, and you can't sign in.
This issue occurs if you use the Trusted Sites feature in your browser and you don't add the URLs for Microsoft Teams to the list of sites that your browser should trust. In this situation, the Teams web client can't sign in.
To resolve this issue, update your browser settings by using the steps in the appropriate section. Click here for step by step Instructions.