Hi,
Thank you for writing to Microsoft Community Forums.
We have tried to simulate the issue on our system, I see that the punctuation signs like ! are not available in Bangla (Bangladesh) keyboard, however you can find it on Bangla(India) keyboard, to access numerical values you can press the AltGr key on the keyboard and type the value. However, I also suggest you to send your feedback to Microsoft using the feedback hub app that will help us make Windows better.
Regards,
Amit Sunar
Microsoft Community – Moderator