Check your list of installed extensions and remove anything you don't recognize, especially those installed around the time the pop-ups started.
Syndication.realsrv.com is a malicious domain associated with . It typically tricks users into enabling browser notifications by mimicking a fake video player, which then spams the device with intrusive and potentially dangerous advertisements. Guide to Removing Realsrv Adware Step 1: Revoke Browser Notification Permissions syndication,realsrv,com
Go to Settings > Cookies and site permissions > Notifications and remove the domain from the "Allow" list. Step 2: Clean Browser Extensions and Settings Check your list of installed extensions and remove