We kinda had the same error message, but it was because we were trying to use the USCIS receipt number (the one starting with "WAC" and then the numbers) instead of the NVC Case number (which should start with three letters , then numbers which usually are the date the NVC assigned the case number).
Problem with interview schedule
in K-1 Fiance(e) Visa Case Filing and Progress Reports
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Hey there!
We kinda had the same error message, but it was because we were trying to use the USCIS receipt number (the one starting with "WAC" and then the numbers) instead of the NVC Case number (which should start with three letters , then numbers which usually are the date the NVC assigned the case number).
Maybe you were also using the wrong case number?
I hope that helps