Troubleshooting steps and fix - Sitecore XC (9.3) products are not showing in a scaled environment.

Recently, We have done a scaled environment setup and found that the product catalog was not showing in the site.

Investigation steps -  

1. We checked in the Index (sitecore_master_index) and found that product data were missing.

Click on the page, check the sxa URL, solr log and generate the query, As the example below.

https://localhost:8983/solr/axp93_master_index/select?q=((((((((_path:(8174413cc73369a0d61b6ca583c234d4)+AND+commercesearchitemtype_t:(sellableitem))+AND+_latestversion:(True))+AND+excludefromwebsitesearchresults_b:(False))+AND+parentcataloglist_sm:(59ddadc19b88727e9e143f6cf321ae0f))+AND+_parent:(8174413cc73369a0d61b6ca583c234d4))+AND+(_path:(e28e09d9d1534f58a88c66774a19eb5c)+AND+searchable_b:(True)))+AND+_language:(en))+AND+_latestversion:(True))&facet.field=typeofgood_s&facet.field=manufacturer_s&facet.field=brand_s&f.brand_s.facet.mincount=1&start=0&f.typeofgood_s.facet.mincount=1&fq=_indexname:(sitecore_master_index)

2. We verified all logs and found Minion services was trying to hit the wrong master SearchScopeName  name was ( abc_master_index) and showing 404 errors, that points me that something is wrong in the configuration.

We checked the configuration of all four Sitecore roles here, the example below 

C:\inetpub\wwwroot\CommerceAuthoring_xyz\wwwroot\data\Environments\PlugIn.Search.Solr.PolicySet-1.0.0.json

and fixed the index name, it should be the same as XP - master or web.

    

Solution - Please verify the scope in all four roles - PlugIn.Search.Solr.PolicySet-1.0.0.json and correct it that will resolve the issue.