License Lease option throwing invalid user id password error with http 401 error

Hi We got a license installed at Neoload Web and when tried to lease that getting the below error. Please provide your input on this. Thanks !
HTTP response '401: Unauthorized' when communicating with https://neoload-rest.saas.neotys.com/nts/ws/license
Pls note that we are able to connect to the NeoLoad web using access token.

Regards,
Y.S.Sridhar