You could have a look at these below options for your new CM2 instance.
1) Please check the self-signed certificate has been installed in your new server. The SOLR instance is running up with the https certificate.
2) Your xconnect website https://xp0.xconnect/
should be running up with self signed https certificate.
3) Sometimes also seen that the xconnect website faces a trust issue due to the presence of non-self signed certificate in trusted root certificates in MMC.
In power shell administrator mode try to run below command to check how many certificate are in trusted root folder .
PS C:\WINDOWS\system32> Get-Childitem cert:\LocalMachine\root -Recurse | Where-Object {$_.Issuer -ne $_.Subject}
Try to move them to CA
PS C:\WINDOWS\system32> Get-Childitem cert:\LocalMachine\root -Recurse | Where-Object {$_.Issuer -ne $_.Subject} | Move-
Item -Destination Cert:\LocalMachine\CA
4) Type mmc and open your Certificate Store for 'Local Computer'. Right-click your Sitecore certificate > All Tasks > Manage Private Keys
. Grant full control to both NETWORK SERVICE and IIS_IUSRS
. Do it for both xp0.xconnect
and xp0.xconnect_client
certificates.
5) In IIS Manager check the certificate is set for xConnect websites. Set the correct certificate from the list for xconnect website.

6) There might be certificate thumbprint value mismatched, please check xconnect and sitecore instance website certificate thumbprint value, try to place the correct thumbprint value in the intepub xconnect website App_Config folder appsetting.config
, connectionstring.config
and also in the sitecore app_config folder's config files . In case you have created a new certificate and their old certificate thumbprint values are present in that result it can show you an exception.
<add key="validateCertificateThumbprint" value="[CORRECT THUMBPRINT VALUE]" />
<add key="AllowInvalidClientCertificates" value="true" />
<add name="xconnect.collection.certificate" connectionString="StoreName=My;StoreLocation=LocalMachine;FindType=FindByThumbprint;FindValue=[CORRECT THUMBPRINT VALUE]" />
7) Check in the IIS xconnect application pool the identity is set to 'NETWORK SERVICE' also, the xconnect website SSL settings for the content of website or application require SSL checkbox is set to true and client certified is accepted
Finally also please check if there any internal/external network setting is applied which might be also blocked TSL/SSL secure channel communication.
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