I think this may be a duplicate of https://www.wikitree.com/g2g/524840/gedmatch-number-not-kit-id.
As Lynda noted in that question, the GEDCOM (a family tree in the text-based GEDCOM standard) uploaded to your GEDmatch account has no bearing here on WikiTree. Information about the GEDmatch GEDCOM can be found here: https://www.gedmatch.com/gedwiki/index.php?title=GEDCOM_upload.
Worth noting is that you provide a name for the GEDCOM uploaded to GEDmatch. That name is user-assigned (some descriptive title of the family tree) and is not the same as your GEDmatch DNA "kit number." If the error message is at GEDmatch, I'd hazard to say this is the likely culprit. The six digits shown are probably part of a kit number, not a name assigned to a GEDCOM file. WikiTree uses only the kit numbers.
Not including Genesis, which has a separate numbering scheme, GEDmatch kit numbers start with one letter, followed by six digits:
- 23andMe kit numbers start with M
- AncestryDNA kit numbers start with A
- Family Tree DNA kit numbers start with T
- MyHeritageDNA kit numbers start with H
- WeGene kit numbers start with W
Genesis kit numbers start with two letters, followed by seven digits.
