Yes.
A DevAddr as generated by TTN should start with 26
or 27
(hexadecimal). (As an aside: these are not a secret; anyone can pick them up from the radio transmission.)
Then you’re erroneously using a DevAddr that starts with 00
, 01
, 02
or 03
, or you entered it in the wrong order. You should use the DevAddr as issued by TTN, and choose the right option: Hex, lsb or msb? (Check the 2 working nodes).