I've reached my wits end with QBO ignoring the fact that there is an invalid certificate or something that prevents Macs from signing in

Susan, i know you'll not like the reply but I'm a heavy Apple user, iPad and a couple of MacBook Pro's mainly, phone app occasionally. I actually retired my PC when they turned Desktop off, and I've not had this type of issue. Had many many many, many others but I digress.
 
I saw your other post but what are you trying to access what from what if you know what I mean. Are you trying to use the app, or the web portal from a browser?

Just read your other post. Do you not have any access to another laptop or computer to try?

An Apple user for US QBO had the exact same issue, QBO engineers said it was a Mac Authentication issue and fixed if for him - so - whatever they did needs to be applied system wide - attached the error 

I have been using qbo for years, I know the challenges, this is new - and the fact that it's already been acknowledged and solved for a user confirms that, I have said this several times I don't know why it's being ignored, but it's not acceptable.

Wow - 

Stop blaming my equipment.  

I know this hasn't been an easy process for you, Susan.

Let me make it up to you by ensuring this gets investigated.

I understand the importance of logging in to QuickBooks Online to complete our daily business tasks. Being unable to sign in can indeed cause inconvenience. I recommend contacting our QuickBooks Support Team again. They have full access to your account and help get this fixed. It'll also allow them to create an investigation about the issue if necessary.

Here's how:

1. Go to our Contact Us page.
2. Select your Product and Edition.
3. Enter a short description of your concern, then Continue.
   
4. Choose a way to connect with our support.
   

Additionally, I've added this article that'll help you update the card on file, change your subscription, or view your billing history: Check Billing, Payment, and Plan Info.

I appreciate your understanding on this matter. Please know that we're determined to get this resolved. Keep safe and healthy!

Susan, I'm just a user I'm not Intuit so no need to have a go is there. 

The reason why I asked if you had access to other equipment was the MAC address has nothing to do witha Mac. A MAC address is a network issue directly to do with the laptop networking. It identifies the peice of networked hardware and can not be changed.

So, have you tried loging in other hardware.

Hello Mark, thanks for sharing this information for everyone about a MAC on this thread.

Ah, I get it now - you are a bot! An AI bot, here to make it look like QBO is paying attention and that QBO will actually try to solve this problem.

You're not a very good bot, your response clearly demonstrates how you have not listened to a word I have said.  There is no billing and subscription error nor was there ever a question about billing and subscriptions -  If I wanted to talk to a bot I'd ask alexa or siri.

I know what a MAC address is - thanks for mansplaining

Well if you did then you would have tried different hardware.

Enjoy your broken QBO Susan, talking to people like that who are trying to help will get you nowhere.

Wow -

Stop blaming my equipment.

I know what a MAC address is - thanks for mansplaining.

Aren't Canadians supposed to be faultlessly polite?

Clearly one of those internet myths!

I can understand being pi88ed off by the bot responses on here but you really aren't going to get very far if you ignore or slap down offers of assistance from other users.

Suggest you try again.

Maybe post a link to the US community where the problem was fixed or answer the quite simple diagnostic questions that were asked above.

(personally I suspect your Mac - not your MAC - has a malware problem but, I'm only a man, so what do I know?!)