Multisite Adding New Site give me a message that the link has expired

It sounds like you may be hitting some limitations with regards to your platforms resource limitations. If you are able to adjust them, this article may assist:

https://www.wpbeginner.com/wp-tutorials/how-to-fix-the-link-you-followed-has-expired-error-in-wordpress/

The above error in this case is for Media uploads, however it would be similar for other functions such as adding themes or creating new sites within a multisite network.

This could also be a potential issue with how your current multisite configuration is setup. You may find the following article helpful in ensuring that the wp-config.php file and the database is configured correct for the primary domain:

https://www.wpbeginner.com/wp-tutorials/how-to-install-and-setup-wordpress-multisite-network/