When i try sign into minecraft on another platform such as curseforge or lunar client it...

Hello Jamie, sorry to hear you're having trouble.

I've done some research on possible issues for this and have found this Curseforge Support link https://support.curseforge.com/en/support/solut.... that suggests it may be an issue with either how you log into your Microsoft account or possibly an issue with your antivirus program.

What worked for me was starting minecraft from another client like lunar client

Also, same happened with lunar client because i thought it might just be the minecraft vanilla launcher tweaking out.

Thank you for replying, I will try to contact Lunar Client for help.

did not help at all. and no its not a problem with the browser cause i cant log in to xbox too. and i had minecraft in this account but now it says i dont have minecraft account in this account. like what is actually going on with microsoft ? I can even proove that i had minecraft because at the time i had minecraft i played using lunar client and badlion client and i had minecraft purchased using the email address that I am having trouble logging into. I can proove I had minecraft because when i log into lunar or badlion client using this email address they log me into my account with exact same username and the skin. please give me some solutions i asked miencraft about this and they said they cannot help and i have to ask from microsoft.