Can't upgrade with Github Student Pack

I have Github Student Developer Pack. I’m unable to activate the Simple Analytics offer in it. When I try to redeem the offer from Github Pack, it redirects me to this link where it asks me to sign in with Github. Once I signed in, it asks for my email. After submitting my email, it confirms that my account got upgraded and told me to login. Then after login, I can see that my plan is not upgraded. I have even changed my email to my student mail to no avail. I tried redeeming the offer multiple times, but it doesn’t upgrade my plan.