question: localhost vs 127.0.0.1 redirect URI

hi, this is my first time opening an issue so i apologize in advance for it's quality. Nevertheless i am following
https://learn.microsoft.com/en-us/azure/active-directory-b2c/configure-authentication-sample-python-web-app
tutorial and my redirect URI didn't match in step 5.4, exact message from flask:
GET /getAToken.?error=redirect_uri_mismatch&error_description=AADB2C90006:+The+redirect+URI+'http://127.0.0.1:5000/getAToken'+provided+in+the+request+is+not+registered+for+the+client+id+'xxx-xx-xx-xx-xx'.%0d%0aCorrelation+ID:+xxx-xxx-xxx-xx-xxx%0d%0aTimestamp:+2023-05-03+10:03:02Z%0d%0a&state=jsaKCDnFuqMGzkrL

and when i hardcoded the redirect_uri in login route to "http://localhost:5000/getAToken."
it worked.