Here are the materials in Monster Tech. Group v. Eller:

Merits briefs here.
Lower court materials here.
Here:
Questions presented:
Whether a federal court may force a non-consenting, non-Indian plaintiff to exhaust his claims in tribal court when the defendant tribe has expressly consented by contract to federal or state court jurisdiction and waived both sov- ereign immunity and tribal exhaustion.
Whether a state court may adjudicate a contractual dispute between a tribe and a non-Indian where the tribe has provided specific contrac- tual consent to state court jurisdiction; or in- stead, whether the Constitution or laws of the United States prohibit such exercises of state court jurisdiction unless the State has assumed general civil jurisdiction over tribal territory under Sections 1322 and 1326 of Title 25.

Lower court materials here.
Update:
Here is the opinion.
Briefs here.
An excerpt:
We begin by discussing the tribal exhaustion doctrine involved in this case. “[W]hen a federal court has subject-matter jurisdiction over a claim arising in Indian country over which a tribal forum has colorable jurisdiction, principles of comity and the federal policy of promoting tribal self-government generally require that the plaintiff fully exhaust tribal remedies before proceeding in federal court.” Restatement of the Law of Am. Indians § 59 cmt. a (Am. Law Inst., Proposed Final Draft 2021).
slip op. at 14.
Maybe a little more Restatement. . . .
Post–Santa Clara Pueblo, federal review has been limited to habeas, leaving tribal courts to adjudicate any other civil rights claims. See Restatement of the Law of Am. Indians § 16 cmt. a (“With the exception of actions for habeas corpus relief [under § 1303, ICRA’s civil rights] guarantees are enforceable exclusively in tribal courts and other tribal fora.”).
slip op. at 21.

And more. . . .
Tribal exhaustion doctrine exists to preserve tribal sovereignty and prevent the federal courts from running roughshod over tribal legal systems. See Norton, 862 F.3d at 1243; Restatement of the Law of Am. Indians § 28 cmt. a (“[A]djudication of matters impairing reservation affairs by any nontribal court . . . infringes upon tribal law-making authority, because tribal courts are best qualified to interpret and apply tribal law.”).
Slip op. at 34.
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