For some reason Blockchair.com doesn't say when an address is incorrect.
I use blockchain as well and I was surprised, almost all the other popular explorers reject the address with the small c letter.
OP, it's against the forum rules to post twice in a row without waiting for
1- 24 hours to pass
2- someone else to post
You had 5 consecutive posts and that is SO against the rules, please edit this
post and include the other 4 posts in it.