The solution to my login problem was simple. Disable the ad blocker.

It may be that ATT doesn't want you using an ad blocker, I don't know. But when I've had the login problem recently, disabling the ad blocker instantly changes it. Then, once I'm in the email, I turn it back on.

Not sure what to say about this. 

The business about ATT having compatibility problems with Macs seems bogus. Gmail never does. 

My hunch is that ATT thinks it can improve profitability by disallowing ad blockers. Google doesn't work on this model, so there isn't a problem.

Who knows.

Re: ATTHelp/21 hours ago/Hi @Big_SBC_Forum, we are here to help.

I was trying to log into sub accounts of SBCglobal.net email using Chrome.

I tried SO many things: Cleared cache many times, changed password on main SBC account, added security key, Ad Blocker off, tried from

https://currently.att.yahoo.com/,  or  https://loginprodx.att.net/commonLogin/igate_edam/controller.do , incognito Chrome page, nothing worked and it has only gotten worse over the past few weeks.  

Finally was able to login from https://more.att.com/mail/ which was noted on another thread.  

it has been very frustrating to say the least.

Hi @Big_SBC_Forum, we are delighted to hear you were able to access your email account.

If you have any additional concerns, please feel free to reach out to us.

Thank you for contacting us on AT&T Community Forums!

Lafayette, AT&T Community Specialist

This is what I get when I use currently.com takes you to att.com. my sbcglobal.net email only works on att.net!

Currently.com gives me this...

Re: Hi @Big_SBC_Forum, we are delighted to hear you were able to access your email account.

Accessing SBC email via https://more.att.com/mail/ is NOT conisistent.  It is hit and miss.  

Ad Blocker off, cache cleared, etc.

Getting this error message:

https://v1-akamaitech.net%28ghost%29%20%28akamaighost%29%2C%201.1%20akamai.net%28ghost%29%20%28akamaighost%29%2C%20http/1.1%20loginprodx.att.net/apiserver/igate_web_dlom/logOut.do?style=ATTidp&tourl=https://v1-akamaitech.net(ghost)%20(AkamaiGHost),%201.1%20akamai.net(ghost)%20(AkamaiGHost),%20HTTP/1.1%20loginprodx.att.net/commonLogin/igate_edam/controller.do?TG_OP=tg759&style=ATTidp&previousRefID=1621767931966_565416610_CLCCLCL&targetURL=https%3A%2F%2Floginprodx.att.net%2FFIM%2Fsps%2FATTidp%2Fsaml20%2Flogininitial%3FRequestBinding%3DHTTPPost%26PartnerId%3Dhttps%253A%252F%252Flogin.yahoo.com%252Fsaml%252F2.0%252Fatt%26.lang%3Den-US%26Target%3Dhttps%253A%252F%252Fmail.yahoo.com%252Fd%253F.intl%253Dus%2526.partner%253Dsbc%2526.lang%253Den-US

This site can’t be reached

Check if there is a typo in v1-akamaitech.net%28ghost%29%20%28akamaighost%29%2C%201.1%20akamai.net%28ghost%29%20%28akamaighost%29%2C%20http.

@Big_SBC_Forum

This is part of a known issue that we're working to resolve.

In the meantime, please continue to access your email through the Currently.com website.

If you need assistance with anything else, we'll be here.

Thanks for reaching out the to AT&T Community Forums team!

Aminah, AT&T Community Specialist

I just wonder why turning off my ad blocker allows me to log in without a problem, but when it's on, I can't.

It's hard to imagine this happens without some intention, but I could be wrong.

Re: ATTHelp Community Support

@Big_SBC_Forum

We don't have one at this time.

Aminah, AT&T Community Specialist

There's a lot of money to be made betting a large company will fail, and it looks like Yahoo is going this direction.

Do you really believe such a company can't figure how to let its users log in to their email?

Note that Yahoo destroyed another huge part of its business, Yahoo Groups, as well as Yahoo Answers.

What could they be trying to do?