what is the url you get register your demo account?Could you try this? 

https://www.docusign.com/developers/sandbox

FreeLink/甫连信息

🌍 Docusign Partner | Partner Profile

Docusign 2024 APAC Reseller Growth Partner of the Year

The only Docusign Partner globally certified as both a Certified eSignature Administrator and eSignature Technical Consultant.

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Expertise in Docusign integrations with on-premises systems for leading enterprises across various industries.

I have tried with your given url but not happen anything click on “Get started” button
you can see the issue in the video (https://www.kapwing.com/videos/676012acae85be5fd1c9d415)

And also i have tried from the “Developer Account” dropDown (you can see in the uploaded image)
but still not work.

Have you try another network provider?

FreeLink/甫连信息

Docusign Partner | Partner Profile

Docusign 2024 APAC Reseller Growth Partner of the Year

The only Docusign Partner globally certified as both a Certified eSignature Administrator and eSignature Technical Consultant.

Docusign Community Leaderboard Top 5 contributor.

Expertise in Docusign integrations with on-premises systems for leading enterprises across various industries.

still not , but i am trying with that solution

Yes, tried with a different network it’s worked and successfully created the new developer account but I will face the same issue again? (The account is automatically removed after 1-2 days)

you can login the demo account with the url: https://account-d.docusign.com. I haven’t meet this issue before. You can update us 2-3 days later. 

FreeLink/甫连信息

Docusign Partner | Partner Profile

Docusign 2024 APAC Reseller Growth Partner of the Year

The only Docusign Partner globally certified as both a Certified eSignature Administrator and eSignature Technical Consultant.

Docusign Community Leaderboard Top 5 contributor.

Expertise in Docusign integrations with on-premises systems for leading enterprises across various industries.

Yes,Thank you

Again experiencing the same issue:
1. I created a DocuSign developer account yesterday.
2. Earlier today, I added an app and configured the integration keys.
3. After some time, my session timed out, and I attempted to log back in.
4. Upon logging in and navigating to "Apps and Keys," I noticed that the previously added app and integration key were missing.
5. Then i try to login in developer account but I received the following error:Invalid/password."
6. It now seems that my developer account no longer exists or cannot be found.

Also, I tried with different device or with different network and checked my email but I did not receive any notifications about the account being deleted or disabled.