Can't progress in Applied visual design tutorial

Hello everyone. I am stuck in one of the tutorials, however I think it is a technical error.
** Applied Visual Design: Use the strong Tag to Make Text Bold** Is the challenge
The strong tag should wrap around the words “Stanford University”. Is the rule that is keeping me from moving on.
<strong>Stanford University.</strong></p> is my code
It seems to wrap around it to me? And the web page shows it being bold exactly how it is described?
How do I move on? I’ve tried everything. My code looks exactly like it does in the video!
Help would be appreciated. Thanks

The full stop shouldn’t be included inside the strong tag

Can I ask what you mean? What is the full stop? (google didn’t help)
My full line is <p>Google was founded by Larry Page and Sergey Brin while they were Ph.D. students at <strong>Stanford University.</strong></p>
What kind of formatting am I missing?

Thanks to a typo.
The test wasn’t letting me pass because of the (.) after Stanford university
Watch out for punctuation everyone!

full stop is british english for period, or just dot