Unable to registering SQL Server (MSSQL 2008 SP3) in SolarWinds DPA , we are getting below error.

Suggest that you:

1. If you haven't already, please follow the instructions in the Knowledge Base Article hyperlink referenced in the registration error wizard screen above
2. TLS 1.0 has been disabled by default (due to TLS 1.0 vulnerabilities) since DPA 2021.1.1 and later. Update your database's configuration to support TLS 2 or 3 connections.  (Optionally you could override DPA security and enable TLS 1.0. However, lowering security to 1.0 is never recommended). See this related article on disabling TLS 1.0.
3. Call SolarWinds technical support

Suggest that you:

1. If you haven't already, please follow the instructions in the Knowledge Base Article hyperlink referenced in the registration error wizard screen above
2. TLS 1.0 has been disabled by default (due to TLS 1.0 vulnerabilities) since DPA 2021.1.1 and later. Update your database's configuration to support TLS 2 or 3 connections.  (Optionally you could override DPA security and enable TLS 1.0. However, lowering security to 1.0 is never recommended). See this related article on disabling TLS 1.0.
3. Call SolarWinds technical support