Arundhati Sen Thanks for posting your question in Microsoft Q&A. Based on the error message, it appears that token generated and passed from ADF doesn't match with authorization policies configured in Logic Apps.
I suggest you get the token generated in the Web activity (Use developer tools in the browser -> get Authorization
token in the request Headers sent to the management endpoint), then decode the token via https://jwt.io/ and validate the claims such as Issuer, Audience against the authorization policy. If not, please make the changes in authorization policy accordingly.
Otherwise, please share the decoded token info such as audience, issuer (hiding sensitive info such as sig*).