In John14:13(Amp) Jesus says, "And I will do (I Myself will grant) whatever you ask in My Name (as presenting all that I Am) so that the Father may be glorified and extolled in (through) the Son."
We don't need to strive to be in His Name, because we became that when we were born-again. 2Cor.1:19-20(Amp) says, "But the Son of God Christ Jesus (the Messiah), Who has been preached among you by us, by myself, Silvanus and Timothy, was not Yes and no; but in Him it is (always the Divine) Yes. For as many as are the Promises of God, they all find their Yes (answer) in Him (Christ). For this reason we also utter the Amen (so be it) to God through Him (in His Person and by His Agency) to the Glory of God."
Col.1:13-14,18-20(Amp) says, "(The Father) has delivered and drawn us to Himself out of the control and dominion of the darkness, and transferred us into the Kingdom of the Son of His Love IN WHOM we have our Redemption through His Blood (which means the forgiveness of our sins)." We became new creations IN HIM, when we were born-again, but our natural bodies are still capable of sin. The Power of His Blood was to redeem us (buy us back) from the control of this world and cleanse us, wash us from sin on a daily basis. Verses18-20 continue saying, "He also is the Head of His Body, the Church, seeing He is the Beginning (the First Born from among the dead), so that He Alone in everything and in every respect might occupy the Chief Place (stand First and be Pre-eminent) For it has pleased (the Father) that all the Divine fullness (the sum total of the Divine perfection, powers and attributes) should dwell in Him permanently. And the Father purposed that through (by the service, the intervention of) Him (the Son) all things should be completely reconciled back to Himself; whether on earth or in Heaven as through Him (the Father) made peace by means of the Blood of the Cross."
You are as much in Jesus, as Jesus is in the Father, according to John17:20-23(Amp), where Jesus prays, "Neither for these alone do I pray (it is not for their sake only that I make this request) but also for all those that believe in (trust in,cling to, rely on Me) through their words and teachings. That they also may be one (just) as You, Father, are in Me and I in You, that they also be one in Us, so that the world may believe and be convinced that You have sent Me. I have given to them, the Glory and Honor which You have given Me, that they may be one (even) as We are One. I in them and You in Me, in order that they may become one and perfectly united, that the world may know and (definitely) recognize that You sent Me and that You have Loved them (even) as You have Loved Me."
It's difficult to imagine any believers not seeing that we are "one in Him" and that according to Jesus' prayer, the Father Loves us just like He loves Jesus. If Jesus and the Father are One, then we are also one in Him...in His Name, in His place, and in His Glory and honor. When we pray or fellowship with the Father, we're not just using His Name saying, "In Jesus' Name I pray, Amen," but it's as though Jesus is praying in and through us. When my wife and I married, she became in my name. As long as she's in my name, she has access to everything I have. She can do this, because she not only has my name, but she's in my name. God's Word tells us that the husband and wife have become one flesh. She is no longer Mary McNulty, but is now Mrs. James Hayes. The name and person have become one with me.
We're joint-heirs with Christ and Jesus said in John16:17(Amp), "Everything the Father has is Mine." If you're born-again, then you're already in His Name. We should believe this and have confidence that when we pray, we're heard and have the petition that we desire in Him.