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Hi, Rick Van Wieren
This looks more like a sign-in session or account-identity mix-up than a problem with the invitation itself. The invitation may open under a different Microsoft account already saved in the browser.
Besides the solutions provided by the Q&A Assist, here are some suggestions you can try:
On your wife’s device, sign out of every Microsoft account in the browser. Then open an InPrivate or Incognito window and go directly to the Microsoft Family page. Sign in using the exact personal Microsoft account that received the invitation and check for a pending invitation there. Accepting it directly from that page can avoid a broken or looping email link.
Make sure the invited address is a personal Microsoft account, not a work or school account. If the same email address exists as both account types, choose Personal account when prompted.
If it still fails, try another browser after clearing Microsoft-related cookies. Record the exact error message, date, time, and any TraceId shown, then contact Microsoft Support while signed in with the subscription owner’s account. Those details can help support identify a stuck server-side sharing record.
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Thank you for your patience in reading, I hope this information has been helpful to you.
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