I have an iPad and I deleted the Microsoft teams app and when I try to re download it doesn’t work.

Start here >>> Redownload apps and games from Apple - Apple Support

If you have difficulties with reinstalling Apps:

If you can’t download or update apps on your iPhone or iPad - Apple Support

If you are unable to add or remove on your iPad, you’ll need to check your ScreenTime restrictions:

• Settings > Screen Time > Content & Privacy Restrictions > iTunes & App Store Purchases > Adding Apps - ensure that this permission is set to Allow
• Settings > Screen Time > Content & Privacy Restrictions > iTunes & App Store Purchases > Deleting Apps - ensure that this permission is set to Allow