Why I am not able to join iCloud family invitation?
Why am I not able to join iCloud family invitation and it shows something has gone wrong
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Are you already a member of a different family group?
Is your account set to a different country?
To learn how to join a Family Sharing group, read the section "Join a family group" in the document "Set up Family Sharing". This link will take you straight there --> Set up Family Sharing - Apple Support
Knowing more about the exact message would help. Always include those when you first post since htey often tell us exactly what the problem is.
If you still have problems or the message is very general, refer to this page for Apple Support features ➔ Contact - Official Apple Support
Select from the presented options until you find a solution for your issue, or see if there is a chat or phone call contact method offered lower on the page (you sometimes have to narrow down the options multiple times before this is shown). If you do not see your issue, keep experimenting with any series of selections until you reach one that offers a chat session or a telephone call and get the representative to redirect you.
This support article has various country telephone numbers for contacting Apple for support and service ➔ Contact Apple for support and service - Apple Support