I'm using simple tags to categorize my items in engine for example "AssaultRifle" or "SMG". SMG is accepted but AssaultRifle is not. Im not sure what the requirements for a tag are but its really annoying to have specific requirements for something as generic as a tag.
A pre-set list tags can be set by providing a list of valid strings. Have you set up a list of tags? If not, you can find the pre-set tag list in the [Title Settings] -> [Economy] page, add the tag you want to use to the list, and then you can select the tag you want in the edit item page.
I added my tags to the list on my economy settings. It took about 5-10 minutes for things to be updated to where I didn't get that error.
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