Hi @tim.dang1,
Welcome to the Auth0 Community!
I understand you have encountered issues using the Management API to update your user’s user_metadata.
Normally when the “Bad header format request” error happens, it is because the Access Token being passed in is not specified as a Bearer.
So in this case, I recommend that you set the Token value to something that looks like the following:
token: 'Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCIsImtp....'
Please let me know how this goes for you.
Thanks,
Rueben