If we already have a Microsoft 365 / Dynamics 365 tenant, we can directly request the trial for Dynamics 365 Marketing from Microsoft 365 Admin Center https://admin.microsoft.com through Purchase services > Dynamics 365 Marketing option.
And within Power Platform Admin Center https://admin.powerplatform.microsoft.com/, we can navigate to Dynamics 365 Apps >> Dynamics 365 Marketing Application solution and select Manage.
Here Dynamics 365 Marketing Application is the full application with both the solution and the services and Dynamics 365 Marketing Solution Only provides the entities without services.
Select the appropriate Dynamics 365 Organization.
Provide the address and click on Setup
After a few minutes, the setup would complete.
Take me to the app will open the Dynamics 365 Marketing App.
We can also set up Microsoft 365 Tenant or Dynamics 365 trial https://trials.dynamics.com/
(in case if we do not have one).
Microsoft recommends to sign up for Microsoft 365 E3 Trial
After the tenant is set up, go to Get started with Dynamics 365 Marketing page to set up the free trial.
Here we provided the existing tenant’s account used.
Once the setup is done, the same sign up now options takes you to the instance picker page
Clicking on Open asks for an address.
Clicking on Begin opens the Dynamics 365 Marketing App.
We can log in to the Power Platform admin center and can see the environment created for the marketing app.
Get all the details here –
Hope it helps..