Session token is returned to Auth0 is invalid

Have followed step by step guides provided by Auth0 here to redirect user after login to external site to collect info. I am currently attempting to send info back to Auth0 via signed session token. After trial and error I discovered that this token can be sent back to Auth0 via a parameter in the URL. however it still seems that I am receiving an error stating ‘The session token is invalid: Missing or invalid standard claims’.

as you can see, from my angular project I am simply decoding token passed by auth0 to create new token with my new data

then when redirecting back to auth0 I include my parameters for state and myToken

redirect worked as expected before inclusion of session token. but now in logs this is error I receive.