Hi @Tiger Ser
As seen in the following response on StackOverflow, "conventional routing is not supported by API Explorer (which is what Swashbackle base on)." Their solution was to use Swashbuckle.AspNetCore.SwaggerGen.ConventionalRouting package by chsakell found on https://github.com/chsakell/Swashbuckle.AspNetCore.SwaggerGen.ConventionalRouting
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If this is helpful please accept answer.