I will look into this soon. Trying to resolve my login problem I changed from OAuth2 to password.
Unfortunately I couldnât follow these instructions fully. I cannot login to my Yahoo mail account. Trying to reach yahoo.com or help.yahoo.com or login.yahoo.com is either extremely slow or end up in a blank screen.
Asking mozilla support, they suggested I check
âFirewall: Access Firewall - it might be the defaulton computer or controlled by an Anti-Virus prgram. Set up Thunderbird program as âallowedâ so nothing gets blocked. Confirm Thunderbird is set up as allowed program.â How do I do that?
âVPN: Check computer for a VPN.â I donât use a VPN.
âLocalhost: Do you have anything using the localhost? People who manage websites may typically use eg: Apache Xampp. You need to switch of any program using the localhost whilst setting up gmail. You can enable it again afterwards. I had to switch off Apache Xampp. Confirm nothing is using localhost.â How do I do that?
That sounds like theyâre referring to an application firewall. The firewall that comes with EndeavourOS is not an application level firewall, only a port/IP/protocol based firewall. So perhaps consider this one 
If you have access to one, it might be worth checking with a VPN, to rule out a local DNS or ISP cause.
This is referring to running your own local web-server. Devs may do this to build and test websites theyâre developing locally. I actually donât see the connection with how this might interfere with Yahoo and only Yahoo. Even if you were running a local web-server, DNS would have to map Yahoo addresses to the localhost, which would require your explicit intervention.
You can always have a look in your /etc/hosts file, and just check there arenât any yahoo addresses in there. I would doubt it.
I deactivated the firewall. That didnât help. There is no yahoo address i /etc/hosts. The problem started after I updated eos. Iâm not running any local web-server. Really annoying that I cannot access yahoo from the web.
Any more ideas?
Iâd suggested trying a VPN too, but I realise thatâs not always practical, but if youâre familiar with any options then Iâd suggest considering it. That would eliminate a local network (eg: router DNS), or ISP issue.
The other thing you could try, which is along similar lines to what @andrewb had suggested earlier, is to try a different profile in your browser. Iâd take it a step further though, and try a different system user profile, even if itâs just a temporary one. Create a new user, log in, try to access Yahoo! mail, etc.
I tested creating a new user. Intended to only install Firefox, but all the programs for the original user was also installed. Anyway, I couldnât connect to yahoo.com och login.yahoo.com. I also tried Thunderbird. That was also unsuccessful. As with the other user a window pops up with a long string: https://login.yahoo.com/?src=oauth&client_id=dj0yJmk9WVZUaWRNUUZSQTBNJmQ9WVdrOVNqbHJUMGhtTkU4bWNHbzlNQT09JnM9Y29uc3VtZXJzZWNyZXQmc3Y9MCZ4PTgz&crumb=4A1zbXpvj78&login_hint=mizalpaz%40yahoo.com&redirect_uri=https%3A%2F%2F127.0.0.1&done=https%3A%2F%2Fapi.login.yahoo.comâŚâŚ
This string is not editable and nothing happens if I press Enter. Endeavour reports authentication failure when this window is closed.
As I have mentioned earlier: if I log into windows on the same PC I have no problem with yahoo mail from Thunderbird or the web.
Have you tried copying that URL and opening it in a browser?
Yes - same behavior. I get to the log in screen with my email address on the username line. Clicking on Next, but nothing happens.
This sounds like one for Yahoo support
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Problem solved! (I hope)
In Firefox settings, under Privacy & Security, I cleared more data than before, choosing everything and form info. After that I could login to yahoo mail from both Thunderbird and the web.
Thanks all for your help!!
Itâs curious how clearing data in Firefox, fixed Thunderbird 
Itâs also curious that testing these things under a different user account didnât fix it, as that data that was cleared in Firefox, would not have been present in another user account at all.
Itâs great itâs working now⌠Iâm just not sure of the howâŚ