Hi Mala, in the attached model I've fixed those problems.

So you should be able to open up the attached version, select these 22 edges:



Note don't forget this little one here:



Then you can apply a fillet:



It is helpful to refer to the "object type indicator" here to know if your
selected object is a finished solid or an open surface:



- Michael

Hi Michael, thanks for eliminating the design flaws! I learned from them, replicated them in the design, and also added it to my personal MOI wiki.
Best Mala...