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"MCID" errors in PDFs

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From: Karen McCall
Date: Apr 17, 2023 11:25AM

Afternoon Everyone!
I'm trying to find information on an error that seems to be cropping up more and more. It is that a PDF has a "missing MCID" or a "duplicate MCID".
If you've encountered this error, can you tell me:

1. What accessibility checker you were using.
2. What was the "authoring" tool that created the PDF?
3. Does it show up on untagged PDF that is then tagged?
4. Are the PDFs that it shows up in single PDFs or a PDF created by combining PdFs?
Any help you can provide to assist in tracking down this error message will help find a solution.
If you have a solution, let me know. From what I've read the only solution is to retag the document.
If you have any samples that can be shared, that would be helpful too. So far, I haven't been able to see this error.
Cheers, Karen