Some browsers like Chrome have started blocking the embedding of username and passwords at the start of URLs when embedded into another page.
This means that you can access the resource directly with the username/password at the beginning of the URL, but it won’t work when embedded in another page like SharpTools.
There are a few common workarounds:
If you have the option of using another browser, try a different browser. (Chrome is one of the browsers to have recently blocked this)
Check to see if your camera has another method for embedding the username and password. Some cameras have the option of putting the username and password in the URL query. For example, the iSpyConnect Camera Database has a number of other Amcrest models which appear to take the username and password as part of the URL:
Disable the username and password for the camera within your network (if it’s available within your camera)
Use a dedicated NVR software like Blue Iris which can aggregate feeds from multiple cameras (and has options for disabling username/password for LAN only)