Dynamics Community Forum Thread Details

If you want to use the function it is a little more complicated:

https://{yourOrg}.crm.dynamics.com/api/data/v9.2/RetrieveEnvironmentVariableValue(DefinitionSchemaName='{envVariableSchemaName}')

Using Xrm.WebApi you have to include the metadata, following Microsoft's examples:

var Sdk = window.Sdk || {};

Sdk.RetrieveEnvironmentVariableValueRequest = function(DefinitionSchemaName) {
    this.DefinitionSchemaName = DefinitionSchemaName;
};

// NOTE: The getMetadata property should be attached to the function prototype instead of the
// function object itself.
Sdk.RetrieveEnvironmentVariableValueRequest.prototype.getMetadata = function () {
    return {
        boundParameter: null, // not boud function
        operationName: "RetrieveEnvironmentVariableValue",
        operationType: 1, // because it is a function
        parameterTypes: {
            "DefinitionSchemaName": { // Parameter name
                "typeName": "Edm.String", // Copy the type from the parameter in the function's Microsoft learn page
                "structuralProperty": 1 // Primitive type, we are looking for a string which is the environment variable name
            }
        },
    };
};

var retrieveEnvironmentVariableValueRequest = new Sdk.RetrieveEnvironmentVariableValueRequest("{envVariableSchemaName}"); 

Xrm.WebApi.online.execute(retrieveEnvironmentVariableValueRequest).then(function (response) {
    if (response.ok) {
        return response.json(); // handle the promise result, you can either return or use the .then method
    }
})
.catch(function(error) {
      debugger; console.log(error.message);
    // handle error conditions
});

Your promise result should look like this

Use Web API functions (Microsoft Dataverse) - Power Apps | Microsoft Learn

Xrm.WebApi.online.execute (Client API reference) in model-driven apps - Power Apps | Microsoft Learn

If you are OK querying the table directly, you can take a look at these 2 posts.

It is a regular XrmWebApi/rest call to the table

environmentvariabledefinition

I am copying one of the snippets shown in the first link

async GetEnvironmentVariableValue  function (name) {
    let results = await Xrm.WebApi.retrieveMultipleRecords("environmentvariabledefinition", `?$filter=schemaname eq '${name}'&$select=environmentvariabledefinitionid&$expand=environmentvariabledefinition_environmentvariablevalue($select=value)`);

    if (!results || !results.entities || results.entities.length < 1) return null;
    let variable = results.entities[0];
    if (!variable.environmentvariabledefinition_environmentvariablevalue || variable.environmentvariabledefinition_environmentvariablevalue.length < 1) return null;

    return variable.environmentvariabledefinition_environmentvariablevalue[0].value;
}

Solved: Get Value of Environment Variable using JavaScript - Power Platform Community (microsoft.com)

Get and Set Dynamics 365 Environment Variables from JavaScript | Magnetism Solutions | NZ (Auckland, Wellington, Christchurch and Dunedin)

Environment variable

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