Hi @Sarah Rudston​ 

I got a help from @Kaniz Fatma​ .

I followed this post: https://community.databricks.com/s/feed/0D53f00001jxRjLCAU and tried to remove the dot in my email (I'm using GMail) as username when login and now I can login. The dot is the dot between the email address, not the domain. For example: if your email is first.last@gmail.com then login using firstlast@gmail.com.

Strange though but works.

You might have the same case as mine.

Here's the statement in that post:

"@gmail.com, @googlemail.com, @hotmail.com, @live.com, enter your email as all lower case, remove any dots, and remove any “+” signs and everything after the plus sign from the username/email address."