The Shver insisted

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*ובני ישראל יוצאים ביד רמ"א *The one & only day of the year ר' יוחנן wore Tefilin, was on חול המועד פסח. ( רא"ש ברכות פ"ג ס' ל"א (ע"פ נוסח הרושלמי שהיה להרא"ש* R. Akiva Eiger zt"l brings a ראיה (proof) from a Rashi in Sukah 46a that one is obligated to wear Tefillin on  Chol Hamoed. The תנא קמא holds if one has many Mitzvos to perform, (at the same time) he should make one Bracha "על המצות" Rashi gives an example of how one has many Mitzvos at the same time, for instance, לולב סוכה תפילין ציצית The son in law of R Akiva Eiger Zt"l, R. Shmuel Birenbaum zt"l writes when he came the first time to his Shver (R. Akiva Eiger zt"l) on Chol Hamoed Pesach. His Shver insisted, he put on Tefillin**, even though his family was from a Chasidic background and didn't wear Tefillin on Chol Hamoed. R.A.E. claimed that in Germany & all the surrounding countries, it was accepted to follow תורת משה, the רמ"א, in all his Pesakim, wherever he argues on the בית יוסף. *Chasam Sofer Oc"h 31:2 **from then on he wore Tefillin on Chol Hamoed ,   with no Bracha and made a Tenai The מהרש"ל was not too concerned with the זהר who writes that one who wears תפילין בחוה"מ  is חייב מיתה