Whenever you switch institutions you might consider transferring your data within SURFdrive to your new account. Here is how you do this easily:
Go to Settings in the downloaded desktop client, then click Account and then Remove. This will disconnect your local SURFdrive folder from the account of your old institution. Add the account of your new institution and select the same local SURFdrive folder. Check Keep local data. This way, you can move all files to your new account and synchronize them with SURFdrive again.
Be careful with files shared with you. You can find them in the Shared folder. Move them to a different folder, or delete them locally and ask the owner of the file to share it again with your new account.