Why can't I add the other party as Monopoly GO friend?

Incorrect Friend Link:Double-check that the link format is correct (https://mply.io/xxxx) and hasn't expired.
Friend List Full:The other user's friend list might be full. Ask them to remove some inactive friends to make space.
Network Issues:Ensure you have a stable internet connection. Try again on WiFi if using mobile data.
App Version Mismatch:Make sure both you and the other user have the latest version of Monopoly GO installed.
Regional Restrictions:In rare cases, regional restrictions might prevent adding friends from certain countries.

Ask the other user to send you a fresh friend invitation link.
Try adding the friend by searching their username directly in Monopoly GO.
Restart both the Monopoly GO app and your device before trying again.
If all else fails, consider finding another trading partner who you can successfully add as a friend.