TVE - Can't authenticate Marquee Sports on Xfinity

Have had Xfinity added as a TV source for some time now, has been working great!

Yesterday for some reason Xfinity forced me to change my password.

Deleted Xfinity as a source and re-added everything is working as expected except for Marquee Sports Network (Cubs baseball).

I'm able to login directly on to the Marquee Sports Network website and stream, no problem.

Have stopped and restarted my Channels server, tried other Xfinity IDs, still the same result - and the other TVE channels authenticate as they should.

Last line of the relevant part of the log is: " invalid character 'U' looking for beginning of value"

Any ideas ? Thanks!

Detailed log entry below:
2021/03/13 09:42:08.264565 [TVE] action=auth mvpd=Comcast_SSO requestor=MarqueeSports
2021/03/13 09:42:08.533263 [TVE] action=error_response type=Other error=net::ERR_UNKNOWN_URL_SCHEME
2021/03/13 09:42:08.539214 [TVE] action=set_cookies domains=1 cookies=17
2021/03/13 09:42:08.552478 [TVE] action=mock
2021/03/13 09:42:08.554625 [TVE] action=navigate url=https://sp.auth.adobe.com/adobe-services/authenticate/saml?noflash=true&mso_id=Comcast_SSO&requestor_id=MarqueeSports&no_iframe=true&domain_name=adobe.com&redirect_url=https%3A%2F%2Fsp.auth.adobe.com%2Fadobe-services%2FcompletePassiveAuthentication
2021/03/13 09:42:08.557751 [TVE] action=request type=Document method=GET url=https://sp.auth.adobe.com/adobe-services/authenticate/saml
2021/03/13 09:42:08.834193 [TVE] action=request type=Document method=GET url=https://oauth.xfinity.com/oauth/authorize
2021/03/13 09:42:09.180998 [TVE] action=request type=Document method=GET url=https://login.xfinity.com/login
2021/03/13 09:42:09.181077 [TVE] action=auth_domain domain=login.xfinity.com
2021/03/13 09:42:09.356943 [TVE] action=wait_for_page
2021/03/13 09:42:10.504482 [TVE] action=error_response type=Script error=net::ERR_NAME_NOT_RESOLVED
2021/03/13 09:42:12.675016 [TVE] action=request type=Document method=GET url=https://oauth.xfinity.com/oauth/authorize
2021/03/13 09:42:12.818391 [TVE] action=request type=Document method=GET url=https://sp.auth.adobe.com/adobe-services/oauth2
2021/03/13 09:42:14.270849 [TVE] action=request type=Document method=GET url=https://sp.auth.adobe.com/adobe-services/completePassiveAuthentication
2021/03/13 09:42:14.270923 [TVE] action=authed
2021/03/13 09:42:14.270984 [TVE] action=wait_for_page done=true reason=auth_finished
2021/03/13 09:42:14.274218 [TVE] action=cookies num_domains=2 num_cookies=24
2021/03/13 09:42:14.275654 [TVE] action=error_response type=Document error=net::ERR_ABORTED
2021/03/13 09:42:15.710788 [TVE] Channel scan 111/213 MARQUEESPORTS failed: invalid character 'U' looking for beginning of value