Sling authentication error

I reset my password for Sling and when I try to re-add them as a source in Channels DVR, I get the error message "Cable provider authentication failed". I confirmed my password is correct.
I am using Firefox on PC running Rocky Linux.
Running Channels on Amazon Firestick 4K.
Running Channels version 2022.06.11.1447
I have Allowed for cookies in Firefox for:
https://watch.sling.com
https://identity.sling.com
https://www.sling.com" (put the quotation at the end just so this editor doesn't try to display Sling's graphic for their website)

Here's the log:
2022/06/11 13:35:09.285419 [TVE] Auth starting for slingtv as [email protected]
2022/06/11 13:35:09.558927 [TVE] action=auth mvpd=slingtv requestor=nbcentertainment
2022/06/11 13:35:10.032625 [TVE] action=version product=HeadlessChrome/99.0.4844.84 jsVersion=9.9.115.10 protocol=1.3 revision=@81a11fc2ee8a41e17451f29195387f276d3bb379
2022/06/11 13:35:10.041392 [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
2022/06/11 13:35:10.052919 [TVE] action=request type=Document method=GET url=https://sp.auth.adobe.com/adobe-services/authenticate/saml
2022/06/11 13:35:10.625881 [TVE] action=request type=Document method=GET url=https://identity.sling.com/saml/saml2/idp/SSOService.php
2022/06/11 13:35:10.625927 [TVE] action=auth_domain domain=identity.sling.com
2022/06/11 13:35:10.862324 [TVE] action=request type=Document method=GET url=https://identity.sling.com/saml/module.php/authbypass/firstbookend.php
2022/06/11 13:35:10.932064 [TVE] action=wait_for_page
2022/06/11 13:35:10.954255 [TVE] action=request type=Document method=GET url=https://identity.sling.com/saml/module.php/authbypass/firstbookend.php
2022/06/11 13:35:11.035852 [TVE] action=request type=Document method=GET url=https://identity.sling.com/saml/module.php/authSynacor/login.php
2022/06/11 13:35:11.478485 [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)(0xc000c35140), Exception:(*runtime.RemoteObject)(0xc00048f320), 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)
2022/06/11 13:35:16.918750 [TVE] action=page_ready
2022/06/11 13:35:16.918798 [TVE] action=wait_for_page done=true reason=page_ready
2022/06/11 13:35:16.918812 [TVE] action=fill_form [email protected]
2022/06/11 13:35:16.925313 [TVE] action=wait_for_auth
2022/06/11 13:35:16.927707 [TVE] action=request type=Document method=POST url=https://identity.sling.com/saml/module.php/authSynacor/login.php
2022/06/11 13:35:22.308801 [TVE] action=page_ready
2022/06/11 13:35:28.926436 [TVE] action=auth_timed_out
2022/06/11 13:35:28.926523 [TVE] action=screenshot
2022/06/11 13:35:29.021952 [TVE] action=screenshot size=26631
2022/06/11 13:35:29.022229 [TVE] action=capture_html
2022/06/11 13:35:29.024814 [TVE] action=capture_html size=1328
2022/06/11 13:35:29.135571 [TVE] Auth failed for slingtv: Cable provider authentication failed

How does the DVR troubleshooting page look. All green checkmarks?
DVR web UI Support > Troubleshooting

Can you login with your Sling credentials and stream at nbc.com/live ?

I would try again. Use a new Private/Incognito browser session. Try a different browser.