Verify the package settings for CPQ, navigate to Setup > Installed Packages > Salesforce CPQ > Configure.
Note: If an Opportunity's Price Book is null and a Quote with a Price Book is made Primary in a single currency org, it will not update the Opportunity's Price Book or create Opportunity Products. Update the Opportunity's Price Book before setting the Quote as Primary.
Check these field values that impact Quote sync:
NOTES:
000381216

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