3326192 - Certificate expiry alerts in your CF tenant are failing with "Unexpected character '=' (code 61); expected a semi-colon after the reference for entity 'client_id'"

You encounter the subject error when configuring certificate expiry alerts in your CF tenant by following this blog.
After deployment the messages are failing at the OData receiver adapter step with a similar error:

com.sap.gateway.core.ip.component.odata.exception.OsciException: An exception of type 'WstxUnexpectedCharException' occurred., cause: com.ctc.wstx.exc.WstxUnexpectedCharException: Unexpected character '=' (code 61); expected a semi-colon after the reference for entity 'client_id'

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HCI, CPI, CI, Cloud Foundry, CF, Unexpected character, WstxUnexpectedCharException, OData receiver, tmnUrl, certificate expiry alerts , KBA , LOD-HCI-PI-CON-OD , OData Adapters , Problem