What is the ruling on combining prayers at work during rainfall in a prayer room which obligatory prayers are not observed? حكم الجمع في المطر

In the name of Allah, The Most Gracious, The Most Merciful.
Combining prayers during rainfall is permissible if not joining will result in difficulty and hardship. This is supported by a hadith narrated by Muslim9705) on the authority of Ibn Abas (May Allah be pleased with him) who said that:
“The Messenger of Allah (peace be on him) combined the noon prayer with the afternoon prayer and the sunset prayer with the Isha prayer without being in a state of danger or rainfall. And in the hadith transmitted by Waki' (the words are):
" I said to Ibn Abas: What prompted him to do that? He said: So that his (Prophet's) Ummah should not be put to (unnecessary) hardship." And in the hadith transmitted by Mu'awiya (the words are): “It was said to Ibn' Abas: What did he intend thereby? He said he wanted that his Ummah should not be put to unnecessary hardship.”
The same hadith was also narrated by Malik (332) and on his commentary to the hadith said: I think that there was rainfall, so those who pray in prayer rooms at work are not allowed to combine if they are going to remain at work till the time of Asr because there is no hardship in them performing every prayer at its fixed times. If they finish work before Asr and are afraid of facing some hardship by going out to perform Asr due to rainfall or they will not find other people to pray jama’ah with then it is permissible for them to combine. This is the correct opinion from the two opinions held by the scholars as well as the view held by Hanbali school of thought which happens to have dealt with this issue in greater detail.
And Allah knows best.

Your brother,
Dr. Khalid al-Muslih
12 / 01 / 1425 AH