Origin - Log in Problems (Browser)

Premised that i'm just a gamer and not an expert of software or logins so i advice you to wait at least an expert or developer that will fix you problem,this said can be this:
1) Be sure that you is in the official ea website and not in a scam\fraud page
2) When you open the browser Try push the 3 dots ... then
3) go setting , then "site setting" , enable "Cookies" and be sure that block Third-Paty cookies is not selected,must to be disabled
4) go javascript and enable it (if disabled)
Then is very important to close the browser and TURN OFF phone,wait 1 minute then restart phone and now try login

p.s. Be Careful: Do this only with the official EA website be sure that you are in the official website and not in a scam page

Just for example,more people has problems to login the Nintendo website (a circle always load infinite times but never login)
this is because these people don't add in the browser api.accounts.nintendo.com , api.apps.nintendo.com , api.ec.nintendo.com , mynintendo.com , nintendo.com , accounts.nintendo.com in their browser settings cookies\javascript etc.

When you finish to use the ea website is better if you
disable images
disable cookies,third partycookies
disable javascript
and add to the "Exceptions" list the websites that you want to visit for example:
signin.ea.com,ea.com,accounts,ea.com,steamgifts.com,store.steampowered.com etc.
You must add this on both javascript and cookies

In this way you enable only websites that you add in the list to do cookies,javascript or images,
this is needed for have less % to avoid bad things if when you wrong push some bad pages\links
btw high skill hackers can install cookies,execute javascript and run images on your pc also if you disable them in this way but most of time with common websites and low skill scammers is better have all disabled by default in this way.

I had problems for a long time - the problem is because the login is doing stuff cross-site (ea.com / origin.com). I think I just whitelisted everything and then I could log in.

I'm using Chrome with uMatrix plugin which is probably too advanced for my skills, but it gives me a sense of security and most sites work so I'm happy :D