I need to add keys into Configuration for multi-tenants azure function while the function is executing.
For example :

Key 1 => "api:url:tenantId1", "www.tenant1.com"
Key 2 => "api:url:tenantId2", "www.tenant2.com"
Key 3 => "api:url:tenantId3", "www.tenant3.com"

When I try to add the first key for example then it adds 3 keys … it adds

"api"                null
"api:url"            null 
"api"url:tenantId1"  "www.tenant1.com"

and when I try to bind then it returns null

ApiOptions apiOptions = new ApiOptions();
configuration.Bind(apiOptions);

then apiOptions is null.

And when I try:

configuration.GetSection(nameof(ApiOptions)).Get<ApiOptions>();

It throws exception:

"Cannot create instance of type 'System.String' because it has multiple public 
parameterized constructors."