This is a KB on how to manually add a firewall to NSM.
Warning:
NSM Advanced License will automatically reboot firewall when adding to it to NSM.
For NSM Advanced License, NSM will configure reporting on the firewall. The process will enable AppFlow on firewall, which will reboot firewall automatically without notification. It is recommended to configure in an maintenance window.
For NSM Essential License, NSM uses CTA reports for reporting. This does not need to configure AppFlow on firewall. It does not need to reboot firewall.
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Steps to add a firewall to NSMÂ manuallyÂ
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Step 1: Log into mysonicwall.com, click on the serial number of the firewall, go to Product Details page, change to Cloud manage, make sure Zero Touch is disabled;

Step 2: Log into NSM this tenant, noticing the firewall is offline unmanaged. Clicking on Hamburg at the end of the line ;

Step 3: Edit Settings popup will show. Enter the login information for the firewall in 3 areas:
IP Address with Port. Note that even it uses default port 443, it has to be included: example 34.25.61.2:443
Username
Password

Step 4: Log into firewall, create access rule to allow NSM WAN access. NSM FQDN and IPs can be found in this KB:
https://www.sonicwall.com/support/knowledge-base/sonicwall-nsm-FQDNs-and-ip-list/200810081626220/
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In NSM, firewall status should be eventually Online Managed.