3574304 - warning 'Service is not known by any Gateway Hub' after report /UI5/UPD_ODATA_METADATA_CACHE is run

In the log of report /UI5/UPD_ODATA_METADATA_CACHE, the following messages appear:

|<date>|<time>|0000000001|I|Cache tokens for backend context updated in 20 ms                                                       |     00      |    001    |     I      |
|<date>|<time>|0000000002|E|Not all Gateway Hubs could be called due to errors                                                         |     00      |    001    |     I      |
|<date>|<time>|0000000003|I|Of <x> service URLs, 0 succeeded, <x> unknown, 0 with errors                                      |     00      |    001    |     I      |
|<date>|<time>|0000000004|I|For more information,see documentation of report /UI5/UPD_ODATA_METADATA_CACHE   |     00      |    001    |     I      |
|<date>|<time>|0000000005|W|Service is not known by any Gateway Hub: /sap/opu/odata/<SERVICE>                         |     00      |    001    |     I      |
(...)        
|<date>|<time>|0000000298|W|Service is not known by any Gateway Hub: /sap/opu/odata/<SERVICE>                         |     00      |    001    |     I      |
|<date>|<time>|0000000299|W|Service is not known by any Gateway Hub: /sap/opu/odata/<SERVICE>                         |     00      |    001    |     I      |

(...)
|<date>|<time>|Job finished   

But the job ends properly.

UI5, Gateway Hub, metadata cache, warning message, informational message, report error, App Index, Descriptor, Variants, note 3533167, metadata update, Gateway service, troubleshooting, UI5 infrastructure, error resolution, metadata correction , KBA , CA-UI5-ABA-AIDX , UI5 App Infrastr.: App Index,Descriptor & Variants , Problem