3763600 - Fiori app search error: App search had an error which prevents showing app search results

In Fiori All apps search, input search keywords(such as 'create'), got the error:
© App search had an error which prevents showing app search results.
Please try to reload the page.
(AppSearchError) 

And from HTTP F12 watch trace, can see the following error:
=============================================================
Failed to load resource: the server responded with a status of 404 ()
...... AppSearchError App search had an error which prevents showing app search results.
Please try to reload the page.
AppSearchError: App search had an error which prevents showing app search results.
    at p.search
    at async Promise.all (index 0)
--> Previous error was: ESHUIError FLP SearchableContent Service Failed - App Search won't be available.
ESHUIError: FLP SearchableContent Service Failed - App Search won't be available.
    at p.initAsync
Searchsystem:  Client:  ESH Search API Provider: abap_odata
 - ErrorHandler sap.esh.search.ui.error.ErrorHandler
=============================================================

SAP S/4HANA Cloud Private Edition 2025

/sap/opu/odata/page_builder_pers, page_builder_conf, page_builder_cust, The details of the tiles on the page could not be loaded, OData response for GET, /sap/opu/, HTTP request failed  , KBA , CA-FLP-FE-COR , SAP Fiori Launchpad Frontend Core and Services , BC-EIM-ESH , NetWeaver Enterprise Search , Problem