Power Query error 'The key didn't match any rows in the table.' when combining

Now a bit of information on my data sheets. The workbooks I'm trying to combine are tabled and also contain 2 tabs each. I'm trying to specifically combine 1 of the tabs from each sheet. In the Power Query navigator, it shows the options of 'Table' and the named tab I want to focus on.

I tried to separate the 1 specific tab into one book and ensured all of my books have the exact same headers. When I try to combine I still receive the same error.

Do I have to un-table my sheets? Or do I have to create a new book for the specific sheet I'm looking to combine? Please help!