SIM Toolkit application gets hidden

I have a SIM toolkit application from my mobile operator, I use it to authenticate to my bank account.
When the server requests authentication, the SIM toolkit application beeps and should pop up. Sometimes it works, but more often it just beeps and I can’t access the application anywhere from Android launched application.
I found a workaround launching the SIM toolkit application from the launcher, but that complicated.
Are there similar experiences and recommendations ?

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