Did you amend by preparing a Form 1040X after the original return had been fully processed? How long ago did you file the amended return? It takes the IRS at least 20 weeks---and often longer-- to process an amended return.
You can watch for information here:
https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1
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