The actual issue is that the EPS is no good.
Does it open correctly in any other software, such as Illustrator?
Actually the EPS is created in MathType and it's correctly opening in the software, and pl. note that other EPS files are loading fine in InDesign.
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Let's break it down into possibilities.
(a) The EPS is not good.
(b) InDesign cannot read this perfectly good EPS.
As for option (a):
Actually the EPS is created in MathType and it's correctly opening in the software
You mean, it correctly opens in MathType itself? Well, try opening it with something else. (Uh, I mean not with MathType itself, or another version of MathType, or with InDesign again. Try something else.)
It could be not all MathType EPS files are good, or possibly there is something in this file of which MathType doesn't think is a problem (but in fact it is), or there is no problem in the file (but InDesign thinks there is).
By the way, it's pure nonsense to test the state of an EPS file with MathType. MathType does not 'open' EPS files; it doesn't look at the EPS part of it at all. All MathType does is re-create your equation on screen using the encoded private information that itself has stored into the EPS file (and which, in turn, is not used by InDesign, Illustrator, or any other software package other than MathType).
pl. note that other EPS files are loading fine in InDesign.
Perhaps those other EPS files are good and this one is not.
As for option (b):
If InDesign does not read this EPS even though it is perfectly okay, there is nothing you can do to InDesign to make it accept it. So you still have to treat this Perfectly Good EPS as if it's a Bad EPS, and find another way to re-create it, convert it to another kind of EPS, or to another file format with which InDesign has no problem.
As for the "actual issue":
if (a) is true and (b) is false, the issue is that MathType creates EPS files that do not comply to the determined standards;
if (a) is false and (b) is true, the issue is that InDesign is not able to work with EPS files that comply to the determined standards;
if both (a) and (b) are true, you have to take it up with both MathType and Adobe technical support;
if both (a) and (b) are false, then I don't know what the actual issue could be.
Thanks Jongware, problem identified now like one of the symbol used in EPS is not applied with the correct font. Once corrected this font issue, EPS is loading fine in InDesign.