2021 Return from March 2023 Still Pending - Received IRS Letter Mentioning Identity Theft Hotline - Need Help With $7k Refund

Filed my 2021 taxes back in March 2023 and still waiting. Called IRS multiple times but keep getting different answers. Can someone look at my account transcript and tell me what's going on? My Where's My Refund tool hasn't updated since May and I'm getting desperate for answers. My refund is over $7k and I really need this money. I just received a letter from the Internal Revenue Service from the United States Department of the Treasury from MEMPHIS, TN 37501-1498. The letter states "Information About the Request We Received" and "Why We're Contacting You" followed by "We're contacting you to report on the status of the request we received." Under "Information About the Status of The Request" it says "On January 25, 2025, you submitted a request for information" and then "We apologize for the inconvenience, but we are not able to process the requested tax year at this time. Please note: Transcript requests for other tax years may be available You or your representative can contact the Identity Theft Toll-free at 800-908-4490 for any tax year that is not available." I don't understand why they can't process my 2021 tax year transcript. Does this mean there's something wrong with my return? Why would they mention the Identity Theft hotline? Is my return flagged for identity theft? I'm so confused and really need this money. Has anyone dealt with something similar or know what this means for my refund status?