If your client certificates were signed by a third-party CA, you must install the third-party CA certificate, and then add it to the Trusted CA list.
To install a third-party CA certificate, perform the following steps:
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In Certificates & CAs, click Known CAs to display the Install CA Certificate section
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Enter a value for the Certificate Name and paste the CA certificate text in the Certificate field
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Click Install. The CA certificate will be added to the Known CAs list
To add the third-party CA certificate to the Trusted CAs list, perform the following steps:
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In Certificates & CAs, click Trusted CA Lists to display the Trusted Certificate Authority List Profiles
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Click on the Default Profile Name
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In the Trusted Certificate Authority List, click Edit
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From the list of Available CAs in the right panel, select the third-party CA you require
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Click Add
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Click Save