Junaid and Kasun - sorry, my description may have been to short.
The problem is not, that we don't have a trial. We have a Trial-License, that will end in November 2020 and we have dozens of D365FO machines on Azure.
With partner trial, I mean the license that you see in the O365 Admin panel.
This is valid for one year and this was created in recent years with the Partner-Trial-Offer-Link on the page behind the Partner Source Link.
Every time, we used that link and the process behind, we received a Partner Trial license in the O365 Admin panel. Two years ago, we did this twice by accident and then we had two of those licenses in the O365 Admin panel.
From my point of view, this Partner Trial license is the prerequisite to create Azure Environments within LCS.
Within the documentation on https://docs.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/dev-tools/sign-up-preview-subscription the "Subscribe" section is before the "LCS" section.
I think, this is because without that license it would not be possible to choose D365FO in LCS at all.
The problem is, in the subscribe section there is nothing we can click on (except the https://trials.dynamics.com/ that is not what we need here).
The formerly contained link "sign up for the Microsoft Dynamics 365 for Finance and Operations Partner Trial" is gone and I'm not aware of any alternative to renew our existing Partner Trial license.
