In bambu studio, switch to devices tab, on the box that says ext spool, click on the pencil icon and select brand and type
Strange that I would tell the PRINTER what filament was there by going to the SOFTWARE on another device (my laptop). I did as you recommended, and the printer appears to already know what filament is loaded. So that does not explain the repeated error messages
You can also do it on the printer. There’s the filament tab. You can do the same thing. It actually makes sense if you consider that you may have something else loaded on that external spool. This way the printer can stop you starting a print for PLA when you have say PA-CF loaded. Don’t take this the wrong way but I think you’d benefit from making yourself a bit more acquainted with the printer.
You can do the same from the filament tab on the printer, select the ext spool and change to what filament you are using