1 Salesforce domain.
Find the Salesforce domain in use.
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2 okta trusted Origin folder.
Within the okta . In Okta administrator menu select Security/API and choose Trusted Origin folder.
Add the salesforce domain to the secure origin origins list. The result should look like the following.
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Only for problem solving
If nothing works, try the following ( only for problem detection ).
In Okta administrator menu select Customizations/Other and scroll down the page.
Depending on what you see here please choose the other option.
Select Choose Allow IFrame embedding. (This way should not be used in productioncould be a security issue within a produktive system)
If it works this way then further investigation (domain configuration) on your side needs to take place.