Hello Staynavytom,
Thanks for updating us.
As you mention the invitation or link isn't being received, could you clarify how you're sending this invitation? In addition, be sure the file or folder is stored in iCloud Drive with the recipients using supported software.
We'll include the details needed for the recipient to be able to collaborate with the files below, and they're also located in the previous resource we provided: Use iCloud to share and collaborate on files and folders - Apple Support
Note: To use iCloud Drive folder sharing, your computer or device must have macOS version 10.15.4 or later, iOS version 13.4 or later, or iCloud for Windows version 11.1 or later.
Note: To collaborate with others on a file or folder, it must be in iCloud Drive.
If you need assistance with adding the file to iCloud Drive, check out the steps below. You can also locate more details on this here: Add your Desktop and Documents files to iCloud Drive - Apple Support
Turn on Desktop and Documents
Turn on Desktop and Documents on every Mac that you want to use with iCloud Drive.
1. From your Mac, choose Apple menu > System Preferences. Click Apple ID, then click iCloud. In macOS Mojave or earlier, choose Apple menu > System Preferences, then click iCloud.
2. Make sure that iCloud Drive is turned on.
3. Next to iCloud Drive, click Options.
4. Choose Desktop & Documents Folders.

5. Click Done.
If you want to store your files in iCloud Drive and another cloud storage service, you can keep copies of your files in both, but you can't keep folders from a third-party cloud service in iCloud Drive. You can keep your other cloud service folders in a different place on your Mac, like the home folder.
Let us know if that helps out, and confirm the requested information if you still need assistance. Any additional details you can include for us to understand this clearer, feel free to include them.
Have a great day!