What is the authenticity of the hadith "I ask You by the right of those who ask You," what is it called, and what is its ruling?

The text of the hadith mentioned in Musnad Imam Ahmad and elsewhere states that whoever recites a specific supplication upon leaving for prayer, Allah will assign seventy thousand angels to seek forgiveness for him, and He will turn His Face towards him until he finishes his prayer. This hadith has been classified as good by some scholars and weak by others. Sheikh al-Islam Ibn Taymiyyah mentioned that the right of those who ask upon Allah is that He answers them, a right which He, Glory be to Him, has obligated upon Himself, just as one seeks through faith and righteous deeds. Some have used this hadith as evidence for the permissibility of intercession (tawassul).