Hi,
I think the first thing to do is make sure you have everything connected correctly as it was before.
Meraki is super simple, as long as you have an internet connection it will work perfectly.
Another thing I suggest is opening a support case.
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
Please, if this post was useful, leave your kudos and mark it as solved.