With the change to licensing in October I don't think you can extend your trial anymore. Your only real option is to convert it to a paid production license.
Hi @Ohsung ,
Do you want to extend your PowerApps free trial license?
Currenly, Free trials for Microsoft Power Apps last 30 days in default. If you want to extend your PowerApps free trial license, please consider submit an assisted support ticket through the following link:
If you just want to develop your own apps using PowerApps Studio, I think the PowerApps Comnunity Plan would be better for you. Please check the following article:
Note: You would not be suffered from "Trial Expiration" notification of PowerApps when using "Community Plan".
The community plan is a good option if you are trying to learn, but you need to recognize that there are some limitations on the community plan. For example, the community plan is a single user environment so you can't share anything. It also doesn't support the use of the on-premises gateway. So although it is useful when learning it isn't a substitute for an actual dev environment.
If anyone is still trying to find a link to extend trials, this link worked for me to see all my subscriptions, trials included & ability to extend for a further 30 days. https://admin.microsoft.com/Adminportal/Home#/subscriptions
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