Sling not authorizing

I removed Sling as a source because it wouldn't authorize ESPN channels. In trying to reinstall Sling as a source, it is not authorizing it.
Here's the log:
2022/02/28 22:00:44.022512 [TVE] Auth starting for slingtv as [email protected]
2022/02/28 22:00:44.022581 [TVE] action=auth mvpd=slingtv requestor=nbcentertainment
2022/02/28 22:00:44.444549 [TVE] action=version product=HeadlessChrome/96.0.4664.110 jsVersion=9.6.180.21 protocol=1.3 revision=@d5ef0e8214bc14c9b5bbf69a1515e431394c62a6
2022/02/28 22:00:44.445438 [TVE] action=navigate url=https://sp.auth.adobe.com/adobe-services/authenticate/saml?noflash=true&mso_id=slingtv&requestor_id=nbcentertainment&no_iframe=true&domain_name=adobe.com&redirect_url=https%3A%2F%2Fsp.auth.adobe.com%2Fadobe-services%2FcompletePassiveAuthentication
2022/02/28 22:00:44.450253 [TVE] action=request type=Document method=GET url=https://sp.auth.adobe.com/adobe-services/authenticate/saml
2022/02/28 22:00:45.036661 [TVE] action=request type=Document method=GET url=https://identity.sling.com/saml/saml2/idp/SSOService.php
2022/02/28 22:00:45.036700 [TVE] action=auth_domain domain=identity.sling.com
2022/02/28 22:00:45.284019 [TVE] action=request type=Document method=GET url=https://identity.sling.com/saml/module.php/authbypass/firstbookend.php
2022/02/28 22:00:45.347056 [TVE] action=wait_for_page
2022/02/28 22:00:45.386381 [TVE] action=request type=Document method=GET url=https://identity.sling.com/saml/module.php/authbypass/firstbookend.php
2022/02/28 22:00:45.463553 [TVE] action=request type=Document method=GET url=https://identity.sling.com/saml/module.php/authSynacor/login.php
2022/02/28 22:00:46.052069 [TVE] action=exception err=&runtime.ExceptionDetails{ExceptionID:1, Text:"Uncaught", LineNumber:21, ColumnNumber:11, ScriptID:"6", URL:"Third-party cookies are disabled", StackTrace:(*runtime.StackTrace)(0xc000feb000), Exception:(*runtime.RemoteObject)(0xc000eab680), ExecutionContextID:3, ExceptionMetaData:easyjson.RawMessage(nil)} value=TypeError: Cannot read properties of null (reading 'classList')
at toggleClass (Third-party cookies are disabled)
at HTMLDocument.deployBfap (Third-party cookies are disabled)
2022/02/28 22:00:51.300562 [TVE] action=page_ready
2022/02/28 22:00:51.300629 [TVE] action=wait_for_page done=true reason=page_ready
2022/02/28 22:00:51.300654 [TVE] action=fill_form [email protected]
2022/02/28 22:00:51.308234 [TVE] action=wait_for_auth
2022/02/28 22:00:51.314914 [TVE] action=request type=Document method=POST url=https://identity.sling.com/saml/module.php/authSynacor/login.php
2022/02/28 22:00:56.803310 [TVE] action=page_ready
2022/02/28 22:01:03.309635 [TVE] action=auth_timed_out
2022/02/28 22:01:03.309691 [TVE] action=screenshot
2022/02/28 22:01:03.413027 [TVE] action=screenshot size=25875
2022/02/28 22:01:03.413279 [TVE] action=capture_html
2022/02/28 22:01:03.415756 [TVE] action=capture_html size=1328
2022/02/28 22:01:03.592868 [TVE] Auth failed for slingtv: Cable provider authentication failed

I see at the end of your log that a screenshot was taken during the process. If you look at the screenshot, it may provide more details about the problem.

See DirecTV TVE lost 60 channels due to error 0066 - #11 by chDVRuser