Seems to work OK here... I just created an account... went to the settings and did this:
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Ftalkimg.com%2Fimages%2F2023%2F11%2F15%2Fz0Uwc.png&t=663&c=z66GL1pjKJW1Gw)
for practice, I set the "new" PIN as 12345678... clicked the "Change Secret Pin" button and it started generating new secrets and gave me a new mnemonic.
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Ftalkimg.com%2Fimages%2F2023%2F11%2F15%2Fz0aEP.png&t=663&c=zXtC0VckoFnKfw)
Are you sure you're only using letters and numbers as specified for the PIN? no special symbols...