I have a problem where the play button flashes 

Play, Play Offline, Play, Play Offline, Play, Play Offline over and over again. 

In the upper right hand corner of the screen of the launcher it says 

"We were unable to verifry what products you own. Please check your internet connetion."

There is a banner at the bottom that is flashing 

"Oh no! Something went wrong, And We coudn't Connect to the Minecraft service. Try again.

Now I have done the following.  I have Taken off any programs that could be a firewall even from my computer at all. So there is NO FIREWALL On my machine.

I have no addons

I have no programs blocking outgoing connections that I know of.

I've tried restarting my Modem

And I have internet on the machine I'm having problems with minecraft with as It is the same machine I'm posting this bug report from. So I have internet enough to post a bug report on the same machine. I also can plays World or Warcraft and Amazon's New World on that same machine that is having problems with Minecraft.

https://help.minecraft.net/hc/en-us/articles/360034754052-Minecraft-Java-Edition-Multiplayer-Connection-Issues-

""Minecraft: Java Edition Multiplayer Connection Issues

If you have successfully logged in to your game, you can sometimes still run into problems with communication between your computer/network and the server you are trying to connect to.

Possible solutions are:

• Check that your network connection is enabled, and that no programs are blocking outgoing connections.
• Try disabling any existing firewall program, or changing its configuration options.
• Restart your modem/router.
• You may also want to try logging out of your account and then logging back in, as this refreshes your profile's authentication and connection with our servers. 

It is also possible that this can occur when the Mojang servers are having difficulties processing requests. If you have tried the above solutions, please wait a bit and try your server login again later.

If issues continue, you may want to contact your network and/or server administrator.

If you're still receiving a connection error after trying the above solutions, then you may want to check that this is not caused by some third-party Minecraft software/mods that you have downloaded. "