I am also facing the same issue, I deployed my Project, and it deployed successfully!! But when i login it logged in also, but get an error that is, 'Unauthorized Error" !! And now I totally confused, what to do??? I literally spend whole day in it, like do some changes in the code, and re-deploying it, and again and again.....!! Even AI can't help me, then I remember Stack Overflow the saviour, I quickly open it, and search my problem then i found this post, and at the end it says, tried another browsers also and it will work on them, so I also quickly tried it, and what....it works!! f**k, I literally spend whole working day in it, and it just a Browser problem, I used Ula browser, and when i check it on Edge or chrome it will works fine!!

My Project Link: https://linkedin-full-stack-clone-using-mern.onrender.com/