Hub 4 and Blink Module

Hey mickb1960, thank you for reaching out and I am sorry to hear you are having some issues connecting to the blink module.

Did any of the above advice here help at all?

Connect Blink Module to Hub 4 (Not Hub 4 to module) It will only connect to 2.4 WiFi so make sure 2.4 GHz is enabled    My system has been working for over 8yrs with no issues.

All connectivity is performed on the mobile device with the Blink app. All reference to home screen is the mobile device Blink app home screen.           https://support.blinkforhome.com/en_US/getting-started-with-sync-module-xr/sync-module-xr-setup

Begin by plugging in your Sync Module.
From the Home Screen , tap the + icon in the upper right corner.
Tap Sync Module.
Scan the QR code on the back of the device or tap Enter Serial Manually. Once the serial number is recognized, select an available system to add your Sync Module. If no systems are available or if none exist, create a new one with a unique name, then tap Continue. Learn more about creating and managing systems.
Once the Sync Module displays a blinking blue and solid green LED, tap Discover Device. If a different light pattern is displayed, refer to Understanding the LEDs on your Sync Module.
You will be prompted to join the temporary Wi-Fi network ‘BLINK-xxxx’ (where ‘xxxx’ is the last four digits of your Sync Module’s serial number). Tap Join / Connect.
From the list of available Wi-Fi networks, select your local Wi-Fi network. Enter the Wi-Fi password and tap Join. If your network does not appear, tap Refresh List. After tapping Join, the Sync Module may perform a firmware update, which can take a few moments.
Once the Sync Module has been successfully added to your system, a completion screen will appear. Tap Done.

So many IoTs and CCTVs come with very poor quality config apps ! 

Try disabling the VM Hub's 5GHz Wi-Fi during the set up of your Blink Camera,
do this from the VM Hub 4 menu.